I listen to a lot of streaming radio. Before there were very specific areas on my daily commute and other areas near my home where 3G would drop out for a few blocks.
I updated my Droid X to 2.2 on Friday. So far there have been no 3G drop outs in these usual places. This is the best feature of Froyo for me.
I have a friend at work with an Incredible and he says 3G seems to be more reliable for him also since the 2.2 upgrade.