Within eclipse, with Subclipse installed, if I right click a project and select \"team\" there are normally 2 options:
If you upgraded your Eclipse recently, make sure you're still using the same SVN plugins... :)
In my case, I upgraded my Eclipse and accidentally installed Subversive instead of Subclipse. The existing .svn directory of the project contained data in the format expected by Subclipse, and so Subversive got confused (e.g. but not showing the "Share Project" option).