I'm waiting for the Linux crowd to make liveUSB versions a *simple* reality.
LiveCDs are not good enough- you can't make any changes and they are slow.
LiveUSB is a reality, but there are several hoops to jump through. Perhaps the hoops are easy for someone familiar with it all, but it doesn't look easy yet to me.
Still, I might be game to have a go at those hoops in a couple weeks when the new Ubuntu version is released.