Torrentvault is general/0day tracker. Content is the same as on every other general tracker but their pretimes are very good and sometimes even beat the bigger sites such as SCC and GFT. Current stats are: ~10000 torrents, ~5000 members
If you want invite all you need to do is to join their miRC channel and type a command:
After you succesfuly join the #invites channel, type !invite YOUREMAIL@gmail.com and the bot will auto send you a invite.