As I write this, I am traveling at about 150 km/h on the German autobahn. I am on the Lifebook S6510 laptop, running Ubuntu, connected via wireless broadband.
I have spent the past four days in Holland, and during that time I have used Linux exclusively. I have sent and received email, surfed the web, done a very small amount of work via VPN connection, and spent a lot of time showing digital photos, and adding new photos to the collection. All without ever booting Windows.
Ubuntu has been up to all of it, without a hiccup. This is good stuff.