NASL has been broadcasting a couple of Tribes: Ascend ShowMatches lately and they have done a pretty good job so far. A few days ago they broadcast a match of ZfZ vs Tao, and it was pretty enjoyable. Take a look:
Game 1:
Game 2:
Game 3:
Tribes: Ascend is currently in open beta and can be downloaded from https://account.hirezstudios.com/tribesascend/