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Here's an article from Prof. Powershell that explains how to run PowerShell 2.0 and 3.0 side by side on the same machine.
http://mcpmag.com/articles/2011/12/20/powershell-2-and-3-side-by-side.aspx

Basically after installing PS 3 CTP if you run: powershell.exe -version 2.0 which will start a PS 2 session.

On a side note: I could not post this response from IE9 and had to use Firefox 9 to post.