Help required in starting to learn Flex 3

Hi All, 
I want to start learning Adobe Flex 3. 
I have various questions. 
1) What is the difference between adobe flex builder 3 and adobe sdk 3.0 
I have heard that flex builder 3 is commercial and adobe sdk is freely downloadable. I would like to know the steps from starting to start learning and writing a simple program using adobe sdk 3.0. I am a layman in flex 3. Please help me.
2) which book or site can I refer to start learning adobe flex quickly. 
Please guide me as I am unable to start learning on my own currently. 
I am using Eclipse 3.4.1. 
Thanks.

Hi,
I think you have to go through sample application made in the Flex, so you will get idea what can achieve with Flex. Here is list of some link hope this will helpful to you.
http://www.adobe.com/devnet/flex/?navID=samples
http://flex.org/showcase/
http://flexsamples.blogspot.com/
http://flex.org/software/components
http://fleksray.org/adobe_flex_components_en.html#popuptoolbar
http://fleksray.org/adobe_flex_components_en.html#Auto%20Complete
http://www.stumbleupon.com/demo/#url=http://techrays.wordpress.com/
Thanks.

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    /people/prateek.shah/blog/2005/06/08/introduction-to-idoc-xi-file-scenario-and-complete-walk-through-for-starters - IDoc to File
    /people/ravikumar.allampallam/blog/2005/03/14/abap-proxies-in-xiclient-proxy - ABAP Proxy to File
    /people/sap.user72/blog/2005/06/01/file-to-jdbc-adapter-using-sap-xi-30 - File to JDBC
    /people/prateek.shah/blog/2005/06/14/file-to-r3-via-abap-proxy - File to ABAP Proxy
    /people/venkat.donela/blog/2005/03/02/introduction-to-simplefile-xi-filescenario-and-complete-walk-through-for-starterspart1 - File to File Part 1
    /people/venkat.donela/blog/2005/03/03/introduction-to-simple-file-xi-filescenario-and-complete-walk-through-for-starterspart2 - File to File Part 2
    /people/ravikumar.allampallam/blog/2005/06/24/convert-any-flat-file-to-any-idoc-java-mapping - Any flat file to any Idoc
    /people/arpit.seth/blog/2005/06/27/rfc-scenario-using-bpm--starter-kit - File to RFC
    https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/1685 [original link is broken] [original link is broken] [original link is broken] [original link is broken] - File to Mail
    /people/jayakrishnan.nair/blog/2005/06/20/dynamic-file-name-using-xi-30-sp12-part--i - Dynamic File Name Part 1
    /people/jayakrishnan.nair/blog/2005/06/28/dynamic-file-namexslt-mapping-with-java-enhancement-using-xi-30-sp12-part-ii - Dynamic File Name Part 2
    /people/michal.krawczyk2/blog/2005/03/07/mail-adapter-xi--how-to-implement-dynamic-mail-address - Dynamic Mail Address
    /people/siva.maranani/blog/2005/05/25/understanding-message-flow-in-xi - Message Flow in XI
    /people/krishna.moorthyp/blog/2005/06/09/walkthrough-with-bpm - Walk through BPM
    /people/siva.maranani/blog/2005/05/22/schedule-your-bpm - Schedule BPM
    /people/sriram.vasudevan3/blog/2005/01/11/demonstrating-use-of-synchronous-asynchronous-bridge-to-integrate-synchronous-and-asynchronous-systems-using-ccbpm-in-sap-xi - Use of Synch - Asynch bridge in ccBPM
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    /people/michal.krawczyk2/blog/2005/08/22/xi-maintain-rfc-destinations-centrally - Maintain RFC destination centrally
    /people/sravya.talanki2/blog/2005/08/18/triggering-e-mails-to-shared-folders-of-sap-is-u - Triggering Email from folder
    /people/sravya.talanki2/blog/2005/08/17/outbound-idocs--work-around-using-party - Handling different partners for IDoc
    /people/siva.maranani/blog/2005/08/27/modeling-integration-scenario146s-in-xi - Modeling Integration Scenario in XI
    /people/michal.krawczyk2/blog/2005/08/25/xi-sending-a-message-without-the-use-of-an-adapter-not-possible - Testing of integration process
    /people/michal.krawczyk2/blog/2005/05/25/xi-how-to-add-authorizations-to-repository-objects - Authorization in XI
    http://help.sap.com/saphelp_nw04/helpdata/en/58/d22940cbf2195de10000000a1550b0/content.htm - Authorization in XI
    /people/michal.krawczyk2/blog/2005/09/09/xi-alerts--step-by-step - Alert Configuration
    /people/michal.krawczyk2/blog/2005/09/09/xi-alerts--troubleshooting-guide - Trouble shoot alert config
    /people/sameer.shadab/blog/2005/09/21/executing-unix-shell-script-using-operating-system-command-in-xi - Call UNIX Shell Script
    /people/sravya.talanki2/blog/2005/11/02/overview-of-transition-from-dev-to-qa-in-xi - Transport in XI
    /people/r.eijpe/blog/2005/11/04/using-abap-xslt-extensions-for-xi-mapping - Using ABAP XSLT Extensions for XI Mapping
    /people/prasad.ulagappan2/blog/2005/06/07/mail-adapter-scenarios-150-sap-exchange-infrastructure - Mail Adaptor options
    /people/pooja.pandey/blog/2005/07/27/idocs-multiple-types-collection-in-bpm - Collection of IDoc to Single File
    /people/sap.user72/blog/2005/11/17/xi-controlling-access-to-sensitive-interfaces - Controlling access to Sensitive Interfaces
    /people/michal.krawczyk2/blog/2005/11/10/xi-the-same-filename-from-a-sender-to-a-receiver-file-adapter--sp14 - The same filename from a sender to a receiver file adapter - SP14
    /people/prasad.illapani/blog/2005/11/14/payload-based-message-search-in-xi30-using-trex-engine - Payload Based Message Search in XI30 using Trex Engine
    /people/sap.user72/blog/2005/11/24/xi-configuring-ccms-monitoring-for-xi-part-i - XI : Configuring CCMS Monitoring for XI- Part I
    /people/michal.krawczyk2/blog/2005/11/23/xi-html-e-mails-from-the-receiver-mail-adapter - XI: HTML e-mails from the receiver mail adapter
    /people/sap.user72/blog/2005/11/22/xi-faqs-provided-by-sap-updated - XI : FAQ's Provided by SAP
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    http://help.sap.com/saphelp_nw04/helpdata/en/14/80243b4a66ae0ce10000000a11402f/frameset.htm
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    JDBC Receiver: exact SQL statement
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    JDBC Receiver: exact SQL statement
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    Learning XI
    XI 3.0 Training
    Also for more info related to XI go through these links:
    XI -Starter
    http://help.sap.com/saphelp_nw04/helpdata/en/e1/8e51341a06084de10000009b38f83b/frameset.htm
    SAP XI - Where to Find Information
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    All the information you need in XI :
    http://help.sap.com/saphelp_nw04/helpdata/en/0f/80243b4a66ae0ce10000000a11402f/frameset.htm
    To understand the architecture of XI, Please go through this link:
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    How the messages are delivered through XI:
    http://help.sap.com/saphelp_nw04/helpdata/en/17/50d440e14f8431e10000000a1550b0/frameset.htm
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    /people/venkat.donela/blog/2005/03/03/introduction-to-simple-file-xi-filescenario-and-complete-walk-through-for-starterspart2
    XI Cerification
    /thread/25311 [original link is broken]
    For XI in General:
    http://help.sap.com/saphelp_nw04/helpdata/en/e3/e60138fede083de10000009b38f8cf/frameset.htm
    ---Satish

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