It seems Rockstar are planning even more teaser sites, Adriaan has done a little research and found 3 more domains registered recently that are all pointing to one of Rockstar's servers.
CrowFest98.com - Possibly a crow festival.
Pastmaster-Game.com - A historical education game, probably a parody of Postmaster.
ItsVivisection.com - Vivisection refers to the dissection of a live animal for scientific purposes.
These domains will probably launch this weekend as it's the last weekend before release.
to find it? Damn, I have this firefox extension that scans a web pages entire directory and it can find ANY site thats on it, so it probably couldve found those newly registered sites. Plus there HAS to be other ways to get ahold of that kind of information. Oh well, it was well worth it huh?