I wrote a bit in my blog about what I'd do about mass transit.

Some stuff I wrote about where I think we're headed with the various computer form factors. I'd add another thought: the virtual desktop machine. This is the machine that actually lives as a VM somewhere in a server farm, and you access it via Remote Desktop or similar. This may engender another type of regular desktop machine: heavy on video and monitor and keyboard and mouse and such, but light on memory and with little or no hard drive space locally because all it runs is the remote-desktop client. It's kind of the inverse of a server, which is heavy on CPU and memory and storage but doesn't have any of the normal desktop peripherals because it never has a human sitting physically in front of it.