One big thing to check is the rose arm joints - (apart from the obvious things too) cos if not maintained they have been known to snap. Can usually hear a creaking coming from the rear of the bike before hand tho.
Oh, and welcome to this side newbie:P - makes a change from you being over there!
Mines a latte please
C
[Edited on 3-8-2005 by CK and AK]