Sprint had promised a first-quarter update for its Touch Pro2 way back in January, and sure enough, it's delivered the Windows Mobile 6.5 boost right on time. It might not have as much punch now that we know everything there is to know about Windows Phone 7 Series, of course, but it's still a pretty big deal -- the Touch Pro2 remains one of the best Microsoft-powered phones you can buy in the States, and unlike AT&T's Tilt2, it launched with that grubby old WinMo 6.1. It's available now, complete with Sense "enhancements" and