In case you're interested in playing with the Bluetooth features of your Treo 650 I thought I'd mention that CompUSA has a USB Bluetooth adapter for $9.99 (+tax on $39.99) after savings/rebates.


I bought one and was able to use it to do reverse DUN and hot syncing. It comes with the "Widcomm" drivers that seem to be the preferred type based on other threads. It's a Class 1 adapter, so it's rated at 100 meters range, although your Treo probably can't send data back from that distance. Supposedly Mac OS compatible too.

(I'm only posting this as a good deal -- I don't get any referral commissions on this as you can see from the URL)