University of Rochester
Drama House
UR International Theatre Program

Local Improv
Buffalo Comedy Sportz (Buffalo, NY)
The Eclectic Company (Buffalo, NY)
Geva Comedy Improv (Rochester, NY)
Nuts and Bolts Improv Troupe (Rochester, NY)
Some Assembly Required (Rochester, NY)

College Improv/Sketch
Kilroy (WPI Sketch Troupe)
Mission Improvable (UMASS Improv Troupe)
Sheer Idiocy (RPI Improv Troupe)
Olde English (Bard Sketch Troupe)

Improv Resources
Fuzzy's Games List
The Groundlings
Improv America (find improv near you)
Improv Encyclopedia (HUGE list of games)
Improv Games at Improvland
Improv Olympic
Improvland.com
Learn Improv
The Second City
Upright Citizens Brigade
Yes And (everything improv)