same here.. been looking for ways to get my mobile network and my streak make use of video calling.. I can't even believe that this gorgeos device doesn't have a simple feature as 3G video calling.. It's very available to my old nokia phone and even to a Samsung Wave phone..
All the searches keeps on ending to the very useless, internet dependent FRING who says yahoo & Live does not support video calling.. big crap..
Fring used to work, same with Tango but since Dell released Froyo they did something weird about how the programs pick up the default camera so now you have to turn your streak around in order to use Fring or Tango and use the back camera. Just horrible.
Took a hands on the Samsung Galaxy tab.. Its supports 3G video call perfectly from the phone application directly. No idea, why Dell choose to neglect the feature.