My Compaq iPaq (3670 upgraded to PPC2002) is very finnicky about recognising my wireless network card. Strange voodoo must be performed in order to make it work, which is quite worrying.
A PPC-based PDA that has me excited is the Fujitsu-Siemens LOOX, which is supposed due out in June. It uses the new generation of ARM processors (xScale), which means it is faster. It also has lots of expansion built-in without adding to its bulk. The expected price is also attractive. Time will tell how of all this is hype!