I'm a relatively recent convert to Subversion, and we're using it for the project I'm currently on. One problem I have with it, which is more a problem with me, is that check-in only checks in files it knows about. Fairly sensible really, but it means when you've added new files to the project you have to explicitly add them to Subversion before the checkin. Something I forget to do, a problem when other team members tend to work later than I do. Phil has stated the law. The count is rising.