So I had to reload my Droid X, and every purchased app that I bought loaded just fine...except for Tetris by EA Mobile.
I noticed that between Christmas and Valentine's Day, EA Mobile cleared all of their Market apps on Verizon and put them back out there. Same versions and everything, but Tetris did not appear as installed for me. Apparently this is because of Verizon's "V-Cast" apps or some kind of exclusivity deal.
Regardless, this was an app that both I and my wife paid $4.99 for at the time, and now we can't get updates or re-download in the event of some kind of disaster with out phones. If we had been informed of this prior to it happening, that would be one thing. And yeah, it's just one game, but I really liked wasting time with Tetris.
Also to note: I've contacted both EA Mobile (actually got an answer) and Google, and they're pointing their fingers at Verizon.