will you d*cks please stop beatching about the wifi-only facetime??? it will obviously come to cellular networks when they manage the throughput so it doesn't bog the whole pipeline down -- if you had 10 million iphones facetiming and the whole att network slowed to a crawl you'd be nonstop beatching about that too.
Bingo. There are a few phones that support video calls over 3g, but it's only because there aren't that many of them out there yet (and since there are relatively few, there aren't many people to make video calls to).
The current 3G networks just aren't ready to support widespread video calling yet, period. But we'll see it someday.