Good tutorial. Two recommendations I would make for people doing a full native installation... if you don't establish an internet connection before before beginning the install, the average first time user will not be able to get
drivers for hardware that wasn't included in the cd... this includes some wireless adapters adapters and hardware that is very old, very new, or isn't commonly used
Also Ubuntu installs much more quickly from a flash drive than from a cd/dvd and the process is no more difficult than burning a CD in windows 7
if you just want to try it for a few days, I would recommend using one of the other tutorials to make a bootable flash drive, rather than using wubi..on the average system, it works better as a portable OS booted from a flash drive than when installed inside windows as a program