"What Palm OS device would you recommend for Business use at the moment?"
I have heard rumours of the PalmOS Treo 700p and found several reviews for the Treo 700w, the Windows CE version. I am surprised to see that the 700w does not have WiFi, only Bluetooth by default. Wifi can be added with an SD card, as it can to the Treo 650, but then you can only have one SD card in at a time, so no downloading to SD memory! But, the 700w is not even in the shops yet and neither is the 700p.
If you want a Phone / Palm combination then currently their isn't really any choice other than the Treo 650. Plus it has a camera too... think I'm sold.
If you don't want the phone (you can connect with your current phone via BlueTooth) then their seems to be little option. If you want a physical keyboard then its the "Tungsten C". If you don't want the keyboard but want WiFi then its the "T|X". Otherwise your choice for a business class PalmOS PDA is the "Tungsten T5".
What would I get? Either the Treo 650 or I'd source a second hand Tungsten T3.
PS. For wireless connectivity without WiFi get a Bluetooth access point, I can vouch for the Tecom BT3021.