Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
I've taken it upon myself to get this index updated. This is all up to date with missing links filled in, name changes reflected, and banned/moved out of tier things removed (following NU's example with this, if they are supposed to stay in the index then I'll put them back in). I plan on updating this post at a later date to reflect updates, as well as add a page about additonal sets. Of course, if there's something that I got wrong or is messed up, please let me know.