Windows Mobile 6 for Palm Treo 750V leaked
AT&T version of Windows Mobile 6 for Treo 750V got leaked. I downloaded it and it works pretty well. The upgrade process was easy, download the file, copy to mini sd (has to be FAT32 formatted), insert the card, reset into bootloader (PTT button + reset), follow on screen instructions.
If you are interested in this upgrade, you can find download links