One thing to also mention on the iTouch - with Skype now available for the iPhones - you can indeed use the iTouch as a Voip device - like the N800. But major limitation being that Skype on Iphone/ITouch will only work on Wifi - and not while you are connected on 3G. The N800/N810 do not have such artificial limitations. In fact I use my N810 to skype home in India even when I am on the roar (with 3.5G over BT).
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...