This is the app that will insure I pick up my new five user copy of Tiger on April 29th. Spotlight is great and I’ve been a Konfabulator user for as long as it’s been available (Apple calls their "version", Dashboard) but iChat AV3 is THE great application in Tiger. My friends and colleagues are scattered around this dirty orb we call home. Now we’ll be able to video conference (well 4 of us at a time that is) cheaply.
Steve Chappell has a great comment about it.