Julian, SVN has a huge advantage of preserving history when you rename a file. Whether it is worth migrating depends on your situation - how much does it cost to migrate, how much history do you have in CVS, how many users to you have, what tools do you use, etc
I have had varying success with it. With a couple of really complicated projects that I tried it on the script had some problems and I ended up resorting to snapshotting the CVS repository to SVN - not preserving history (kept the old CVS repository around for looking at history).
2. Yes - there is a plugin for eclipse. It's called subclipse http://subclipse.tigris.org/ and has all the features of the CVS plugin (and a little bit more I think - although I haven't used the CVS plugin much).
HTH Steve [ September 12, 2006: Message edited by: Steve Dalton ]
One thing that's really nice about Subversion is that it does many operations entirely locally that CVS has to connect to the server for. Adding, deleting, moving, renaming, or tagging files -- and more -- are all done without contacting the server. Things are reconciled when you finally do a check-in. For people using a VCS remotely, as I often do, this is a huge advantage.