Nice one mate, Ubuntu really is a very good OS. Nice and fast as well I find. I'm going to be re-installing Fedora I think on my old Laptop, and totally sacking Windows off on it, as it's a bit unstable, but I never had problems when I had linux on it.
I'm running the 64bit version of Ubuntu on my Laptop, and I also tried out the 32bit version, and the 64bit is noticibly faster