Welcome, puny fleshling. SM64.org has since 2009 been the primary discussion forum for Super Mario 64, especially tool-assisted play (using emulator tools like save-states and frame-by-frame recording). We also have a wiki where we keep track of TAS records and information about the game's features.
As of March 2014, the SM64 TAS community is stagnant, and the site doesn't have much activity. If you want to participate, I recommend going to the Competitions subforum.
2013-03-16: SM64 Star Road 2 [Under development]
2012-11-24: 120 stars TAS submitted
2012-10-18: You'd better watch this
2012-09-01: 120 stars TAS underway
The project is picking up steam! We might at last see a finished 120 stars TAS. Everyone that can contribute should do so.
2012-08-27: Star Road TAS
There is now a full game TAS of SR, in 02:58.65, by MrHigmatar, Ethan, Mickey/VIS and MKDasher!
2012-06-04: TAS records on our wiki
The wiki is becoming more active, and we're gathering all the best TAS records here.
2012-04-11: 1 star BLJless TAS
By Mickey/VIS, Jesus, sonicpacker and Snark. WARNING: May cause seizures.
2012-04-09: 70 stars BLJless TAS
This should speak for itself, go watch it!
2012-03-20: 0 star improvement again
This time, 47 frames saved!
2011-12-24: SM64: Star Road released
We got a great new hack for Christmas this year! Download patch
2011-08-21: Another 0 stars TAS improvement
By part (most) of the "original" 0 Star Team. 13 frames saved at first, then 5 more in an updated m64.
2011-06-27: Super Mario 74 released
This widely-anticipated hack was released into the wild today. Download patch
2011-04-16: 0 stars TAS improvement
A 3 frame improvement to the 0 stars TAS, by Mickey/VIS & snark & ToT, was now accepted at TASVideos.
2011-03-26: 100 Lives TAS
This TAS gets 100 lives as fast as possible. It was made by the Japanese player pastatsh.
2010-12-11: SM64.org Wiki
SM64.org now has a a wiki! It's still quite empty, so you are encouraged to add to it if you're knowledged.
2010-10-10: New 0 stars run submitted
The first update to the 0 stars TAS in 2 years is finally submitted.