HP have now announced the successor to the 6500 series - and have added back WiFi support to the mix. Looks good.
"The iPaq hw6900 features Quad-band GSM/GPRS/EDGE, Wi-Fi, GPS and Bluetooth wireless technology, and Skype Mobile software compatibility. It handles USB 1.1 Client, Serial RS232, and Mini SD Slots, as well as IrDA.
It has an Intel PXA270 Processor (416 MHz), 45MB persistent storage and 64MB SDRAM for running applications, all packed in a 6.33 oz (179.45 g) package. The 1200 mAh Lithium-lon battery is sufficient for a 4h-conference or 7 days of standby. "