"Can some one point me at a single seat glider that won't spin?"

Rutan Solitaire? :-)

Of course there are quite a few that are placarded against deliberate spins..

Always loved deliberately spinning the L-13's the club used to have. The L-23 isn't quite as much fun in a spin. Never managed to get a real spin out if the Twin Astir RG or Acro but the DG-505 does it nicely. We used to have an early Standard Jantar which would drop a wing and spin pretty steep and fast (by glider standards) with little warning. My ASW-15B really has to be provoked to enter a spin.

Regardless of what the FAA found regarding the risk/benefit relationship of spin training in general aviation I would think that with gliders the fact that we spend so much time flying relatively close to stall speed would mean that spin training would have a higher benefit for us than light aeroplane pilots.

Changes made in the training syllabus in Canada regarding spins since I started flying in 1998 are that there is much more emphasis on recognizing stall/spin warning signs and correctly responding to them. The actual full blooded spins are now done with a slow, shallow banked turn combined with too much bottom rudder as the entry. When I started flying we used to enter the spin from a straight ahead sharp stall combined with quick full rudder deflection.