After the Dell Axim X50v got an unofficial Windows Mobile 6 update a few days ago, there’s yet another official and an unofficial update available:
Dell Axim X51v
Users have now managed to back-port Windows Mobuile 6 to the Axim X51v. While users still report issues with things like Windows Live, the overall tenor is positive in the forum thread related to the update(SDHC support, e.g.):
http://forum.xda-developers.com/showthread.php?t=319350
HTC P4350
Users of the HTC P4350 can get an official version of WM6 off HTC’s web site according to PocketPCAddict:
http://www.pocketpcaddict.com/forums/front-page-content/20469-htc-p4350-herald-wm-update.html