I believe the verizon version has the sim unlocked, and the other CDMA versions don't.. Though this difference is probably only a matter of time until we get the HSPL unlocked (which also leads to custom roms). Aside from that the differences are basically aesthetic, for CDMA. And as imnuts said earlier, the 3.5mm headphone jack isn't present on the GSM versions. There are also minor variations of layouts of the keyboard as well. Personally, I think the verizon version is the sexiest, though I'm biased.
