tedster - 7:29 pm on Jun 28, 2011 (gmt 0)
It is a judgment call. If you 302 redirect to a different URL, that URL's content will be indexed as if it lived at the original URL - probably changing the way that URL ranks for as long as the temporary redirect is in place. If that's a result you like, you certainly can try it. I'm not sure how it would do using the strategy in a widespread way.
I'd still probably prefer using a 200, adding a note to the original content and then include a LINK to that alternate page. It holds a lot less potential for search engine havoc.