Thinking about it, that number could include Dells, etc. in Asian IT malls, which almost always seem to have Ubuntu installed on low- to mid-range laptops. I've never believed that most of those machines kept Ubuntu, but I'll wait and see.
The 12.04 beta is almost ready for production, I must say. Been running it for over a month a now, and what few crashes there have been doesn't bring my system down. This release will probably go more smoothly than the ones since the last LTS version.
I (really!) wish GNU/Linux success. And this goes to Ubuntu as well. I use it (a derivate, in fact, but thanks Ubuntu and Debian!). And remember, Mark, to be successful you guys have to solve some problems as mic working with Skype for good ;-)