Hey guys, been a while since I bumped this thread. Please note that some of the information is out of date.
I'm bumping for two reasons: one, we've had a number of new players recently and I'd love to see it grow. One of the problems we've had getting players is a familiar Tetris problem: learning curve. When the only people available to play have been playing a long time and you're new, it's kind of not very fun to get your ass kicked repeatedly.
So, think about giving it another shot

The main reason for the bump though is a major cleanup of the game modes. There are now three main available modes:
1) Change on Attack
2) Exclusive+
3) T-spin only
These all follow the rules described; T-spin only uses immobile detection, not "normal" 3-point.
There are also two revised modes:
4) Air (test)
5) Slow (test)
These are revisions of their previous equivalents to hopefully make them modes worth playing for something other than the lulz.
The new Air mode has a significantly revised garbage table:
Non-spins are as usual
Spins are +1 per line
B2B +1, mini -1
Perfect clears are a stacking +4 (PC + spin double + b2b = +7)
Combos start at 1-combo (two clears in a row) and are a flat +1 all the way across.
The new Slow mode is exactly the same as Change on Attack, except instead of accepting
all of your pending garbage, you only accept one attack at a time.
I hope that slow2 will make the game more accessible to players who may have gotten scared off with crazy spikes and whatnot. I hope air2 will interest people who like perfect clearing - it's basically a perfect clear battle now.
Please let me know what you think of the new modes if you try them out, particularly air2.