List your friend/clan/army/mafia codes for your iPhone/iPod Touch games that use them --

iKnights Online: 217046543
Kingdoms Live: TRM1Z
Mafia Wars: 1203 8274 78
Rockstars Live: 1TV2Q
Vampires Live: 3RRP1

Mafia Wars in particular is a lot of fun (due to having a fairly cool art style) - and it's free. Highly recommended. Vampires Live is not bad though it can be a bit slow to load from the server...