"Plopping it down on a table next to my coffee and just turning it onto "computer" mode would be pretty amazing."

Yeah, I'm excited about this possibility too. It's a shame Canonical couldn't get the Ubuntu on Android project off the ground (too little interest from phone manufacturers/carriers AFAIR). However, all is not lost, there's another project working on this kind of convergence, will happily install their Android ROM when it's ready... https://www.indiegogo.com/projects/linuxonandroid