Bike chat forums - very mixed group of people, some just love riding, some love blasting everywhere at 140mph+ etc
SV650.org - Just for the SV pretty much, but good even if you don't have an SV
The biker forum (bikerforum.co.uk) - pretty nice bunch of guys, always handy and some of them have great rideouts. Generally older, more mature member groups, but I'm 19 and anyone's welcome.