I'm currently using a Linksys WCF12 (Wireless, CF)
It was a real pain to set up (uninstall Activesync, disable all other network devices, reinstall Activesync!), but seems to work well. Only had it for a few days, though
I still do most development/debugging on a Windows GapiDraw build at the moment - I find it more convenient that way
(Does anyone know the filename of Activesync .exe on the PPC? I can't find any way to launch it without putting it in the cradle, or enabling bluetooth and using the bluetooth menu)