External Storage; Raid

Q1>
I am sure this is a 101 question, and the answer exists somewhere, but I am forever lazy
How do you setup an external hard drive (either USB or FW) "cross-platform" for MS Windows and OSX?
I want a media storage system for keeping large video files. The source material may come from multiple computers on these two platforms. I need to exchange data from platform/computer to platform/computer.
Q2>
If you setup a RAID on multiple USB storage devices on one Mac, can you then attach the RAID to another Mac and retain it's configuration and data?
This solution is for media storage that will be used between 3 different Macs.
Mahalo Nui Loa for any assist!
Beavis2084

Obviously above I meant that I have a MacBook Intel Core-Two Duo running 10.6.

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