Try OoVoo.com. We’ve recently put it to use at Team Expansion and up to 6 users can see each other in a six-way web conference for zero smackers — yup, absolutely free. You can also use Skype or Sightspeed for one-on-one conversations.

http://www.oovoo.com

http://www.skype.com

http://www.sightspeed.com