I am beginning to wonder about this myself. I have been on Gingerbread for awhile now, but I notice 3G issues. I can run Subsonic all day long with very few problems when I am on the road, but if I try to fire something up like Netflix, it will work splendidly for a few episodes and then it just bombs on me. I will back out to the home screen and see one of two things: my 3G symbol turns to 1X, or the 3G symbol is grey and showing no activity (unlike its usual blue color...)
Makes me wonder if perhaps Verizon is indeed throttling our data when we use it a lot. Again, just a theory, and I could be way off, but I can't think of any other reason. It seems to happen most when I am using a lot of data (like streaming Netflix).