Sync is cool. You really need to see it in action to appreciate it. You can plug prety much any digital music player into it and browse the contents via voice control. i-pod, playsforsure, zune, usb stick. Whatever. Powered USB port in the center console also charges the device. Voice works very well. You can alos stream music from a bluetooth phone or other device (if it supports it), so for example, if you listen to a variety of streaming stations on the net and your phone has the bandwidth you can listen to them through the BT connection. I listen to Virgin Radio Groove from the UK all the time, being able to do that on the road will be awesome. It will even read your SMS messages if you want, and provide a selection of common replies you can send back using voice commands.
Don't discount sync. Ford has a really cool mobile audio/phone/gadget integration solution in it that is in a whole other class compared to any other OEM audio/bt/nav solution. Sync is the main reaosn I have yet to purchase an Edge. In my case Ford has been stricken by the Osborne Syndrome.
I know a lot of folks go "nav...meh..." but sync is way more than nav. If Ford was wise they would offer upgrades for existing Edge owners.
Anyway, my $.02
-Ian