Looked at fumbbl over lunch and it looks very very good! I've signed up with them and will start playing online there - they have proper leagues and whatnot going on for everyone that plays, looks pretty immense! It's played in a java client so no bg downloads or anything like that, I'll let you know how I get on when I eventually get round to having a game on there! (I kinda wanna skip my 40k tourney and play this all weekend now...)