Galileo came out the other day, and even though plugins under Eclipse are, IMO, just a little bit easier to deal with than Netbeans, it would still be really awesome if ther
I do this:
http://coders-log.blogspot.com/2009/06/manage-your-eclipse-install-with-local.html
Not sure how well I like the approach yet - I'm still trying it out. Essentially, I can create a patch of each plugin install, and the apply it to the new version.
Plus, I use this approach on other products, so I can use the same process everywhere.