Expanding on what I was writing about last night... it looks like ANDROID has also been ported to run as a general purpose OS on ARM. It wouldn't surprise me to see some netbooks shipping with ANDROID by the end of next year. The calling features could be presented as VOIP or they could simply embed 3G and/or EVDO chips. There's a development board called the BeagleBoard that looks interesting. I might pick one up.