If you look in the GG forum, there is a section where other sites can be mentioned, a bit like Casinomeister's "strictly commercial". {edit} It is under "Contests & Competitions".
There ARE indeed other sites that offer "free" money at some casinos, however there is the danger that a casino will issue a bonus ban if you obtain free money through more than one affiliate offering such a scheme.
I have heard of a site by the name of "casino crush", that seems to offer extra free money through tournaments, and it might be worth looking to see if Simmo is currently running some events at SlotJunkies. The US law has hit these types of event very hard, there is less free money around as less players are contributing to casino profits. This may balance out as more players join from outside the US to replace those lost to the casino (many hope this loss is temporary).
For those who are wondering, GG is GoneGambling, a site offering free games for points, and also awards points in the form of scratchcard style game vouchers for such activities as opening new casino accounts or making purchases at existing casino accounts.
Have a look also at KasinoKings site - designed with low rollers in mind, and issues "KasinoKredits" I believe. I have not looked there for ages, too busy whipping the hell out of Xmas promotions
