A couple of leaked Verizon charts popped up on Droid Life this morning, their contents? HTC Thunderbolt propaganda - well, at least in one of them.
If Verizon's estimated LTE speeds aren't just hot air, then Sprint and T-Mobile (and AT&T) should probably be worried right now. Sprint's smartphone plan price hike probably isn't winning them any points, and T-Mobile's 4G handsets aren't exactly new and exciting (G2, myTouch, or a rehashed Vibrant - take your pick).
I don't know where Verizon gets their network speed estimates for T-Mo and Sprint, but they seem pretty forgiving - given the speed ranges shown.