Installing more then one iPhone SDK [closed]

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I was wondering how I would go about keeping Apple's SDK 3.2.1 installed, while also installing the new beta. I am sure this is simple, but wanted to ask before creating a potential problem. Also SKD 2.0 is it possible to get back, like from the Apple site or not?

I am wondering what most programmers are doing to test multiple versions of devices because I hear the iPod crowd is still mostly running 2.0.

Thanks.

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It's pretty standard (and recommended even) to install the entire Xcode tool set with the new SDK in a different root directory. I use /Developer_SDK3.2 for example.