Wireless  Connection: how do I know the speed?

I have my iMac core duo connected via Ethernet to my 802.11n Airport extreme, as well as my mini SCintel via wireless, and my macbook 2.16 core 2 duo via wireless as well. All work well, but i would like to know how to find out 2 things. First, how can i check the bandwidth of my connection, as in my internet connection speed? I have a 3mBs service, and want to know how fast my connection really is> is there an application within my mac, or a 3rd party app that can show me my connection bandwidth or speed? Second question is, is there an application that can tell me who is using my wireless network?
Any help would be appreciated

You can check the speed of your Broadband connection by going to http://speedtest.net
The interface is pretty easy to navigate, just click on a pyramid. The recommended one is gold and the rest are blue.
I am not aware of how to tell the wireless connection speed on a Mac.
You can usually tell who is using your wireless by logging into the router and looking at the DHCP client table.

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