x264 - 10 or so invites, depends on my mood ;]
OK so this is pretty self explanatory. x264 is a tracker with mainly high quality x264 encodes. It has some of the best encoders from all around the web, including some guys from DiGG, SEPTiC, SAiNTS, CTU, all of the x264 guys, you name it, they're found at x264. Don't get confused with HD, x264 has some HD but its mostly 1/3 x264 DVDRips and such. There is also an incredible x264 request section where power users can ask for rare or popular movies to be encoded in x264.
ps, shoutout to LambPete, my fav x264 encoder :] hope you're on this forum somewhere!