When was the last time an ECAC team made it to the Frozen four?
2000 - St. Lawrence.
Matt answered your question before I did.
It's worth mentioning that the last ECAC team to reach the NCAA championship game is Colgate in 1990, and the most recent ECAC team to win the NCAA Championship is Harvard in 1989. Also, the 1994 Harvard team is the last Ivy team to advance to the Frozen Four.
Thanks guys.
And Vermont in 1996 was the last ECAC team not from New York State to make the Frozen Four[TM]. ;-)
And 1980 was the last time Cornell made the Frozen Four (a 5-4 loss to Northern Michigan):
http://www.spiritone.com/~kepler/games/playoff_games.html