Don't ignore Amazon
I think it will be interesting to see how Amazon play in the 'consumer screen' market more and more over the next few years - for example with Ubuntu 12.10 now including Amazon searches etc. how long unti they have a competitor to the Chromebook. The Kindle is morphing into a tablet and all they need is a phone! They definitely have the edge over the others on how to make money from the cloud (i.e. not just free storage and/or ad serving).