Sourceforge.net had maintenance scheduled for a few hours early this morning. It was 1AM-9AM Sunday EDT, then 1AM-9AM EDT Monday if needed.
I have the following installed in my 64-bit Eclipse environment:
Subversive SVN Team Provider (Incubation)
Subversive SVN Connectors
SVNKit 1.3.0 Implementation (Optional)
I believe all you need is the first one. The first time you try to use SVN, the connector will automatically get loaded. Basically, the Team Provider is the Eclipse UI plugin. The connector is the lower-level utility that actually handles the SVN protocol and the network connection(s).
I don't remember what the SVNKit was for; I was probably just playing around.