For example, this exceptionally entertaining post on the unlocks for the support class.
I urge everyone to read it in its gorgeous entirity, but here are my favorite bits for the ADD crowd:
on the EMP grenade
Go up to an emey and yell in his face: "I HAVE NO FEAR FOR I AM FEAR INCARNATE!!!" then run back, in a second your enemy is dead, ok rewind!!!!!!!!
on the Ganz HMG
ARGGG the GANZ!!!! why i dont like this: TOO CRAZY TO FIRE WITH though great dammage i say the accuacy is well... pitifull, well i might be bugged but i heard its suposed to be stable, arggg skrew it NEXT UNLOCK!!!
Really excellent stuff.