People hating on Gamespy for shutting down multiplayer servers should get their hate straight. They should hate Gamespy for selling that part of their business off to another company. "Powered by Gamespy" has nothing to do with Gamespy any more and as far as I know will continue to operate after this. You should hate them for that.
To be honest I haven't read much on the mentioned sites in recent years, but I've been linked to some interesting articles though. I hope the Internet Wayback Machine will provide once the sites' disappear.
Can you find any old gamecenter.com articles? Yep, I wouldn't hold my breath on that last bit:)