3G is the newest and fastest form of celluar wireless data transfer. It's spreading at a decent rate in Europe but is barely here in the US. AT&T Wireless/Cingular offer (as 3G) it in a few metro regions and the same goes for Verizon (called EVDO).
The only Pocket PC phone offered in the US with 3G is the Audiovox PPC-6601 which has a radio that supports EVDO. EVDO is the CDMA network equivalent of GSM's 3G.
-------------------- Lisa Gade Editor in Chief, MobileTechReview