Hi P.L. - welcome to the forum. Hard to know what to recommend if we don't know your budget or what kind of content you want to stream, but, generally, I have several recommendations for people who ask this question.
Barebones - $80 1080p Logitech tripod-mountable webcam
- connect to your laptop and stream to service of your choice
Low budget - $248 Sony Bloggie Live
- streams to Qik.com only.
Medium budget - $289 Cerevo Live Shell
- use any HD camcorder to stream to UStream, LiveStream or YouTube.
Pro - $2490 Teradek Cube HDMI wi-fi encoder/decoder
Some older camcorders have built-in Firewire or USB streaming capability - but this feature has generally been removed from modern camcorders. The $699 Canon Vixia HV40
is pretty much the only Firewire capable HD video recorder that I have been able to find, and it is 3 years old. Nice writeup on it here
Hope this is helpful,
BillHybrid Camera Revolution