I think forced anon is a silly idea, just like I think forced registration is. Also, several issues >>49 (rightly) points out are really just artifacts of implementation, and only tangentally have something to do with the issue of anonymity.
Too many people get anon vs name tangled up with something like kareha vs vbulletin.
I feel a bit strange rehashing a topic that's been beaten to death here though: http://wakaba.c3.cx/soc/kareha.pl/1110953600/