I'm not sure, if the mentioned CVS HEAD from OHF was also in there already?
As I maintain at least 2 different repositories myself for JSR-275 I am
familiar with juggling between the two systems.
I also found, that Eclipse project Subversive was despite a still rather odd
and uncomfortable 2 way installation quite good at creating and maintaining
Tags for various project stages or results.
Not done too much branching with SVN yet, but that one should usually handle
with care and at a low "dose" with most systems ;-)