Have just successfully completed a Windows Mobile 6 treatment for my Treo 750v (HTC Cheetah). It’s available for free for Treo handheld devices at Palm’s website until October 2008.
The most interesting benefit is that after the upgrade, plugging in the 750v device to USB sync cable will also recharge the battery. I used to bring the charger everywhere I go because it wasn’t recharging when connected to the computer with the sync/data cable like what it does with my previous Ipaq PDA.
Regarding the possibility to use the device as a wireless modem with it’s wireless sharing utility, creating a virtually close-range hotspot, I haven’t tried this yet since there’s no bluetooth in my laptop.
Go to Palm’s website for this free treatment.