Now I am not going to start by bashing about your information. It is all correct except...
Wubi is a new application supported by Linux
Wubi isn't really that new of a program it is really 14 months old
, which in the world of linux is over two version.
While on the outside Wubi sounds like a great idea and for the most part is, there are some key issues with it. First while it installs a distro on a hdd it doesn't always remove everything when you go and un-install it.
Second, I feel that if you are going to install linux on your computer you should go through the entire process of partitioning and then installing. (I do of course recommend setting up virtual machines with VMware or Virtualbox)
So, sorry to rain on your day but I just thought that I would inform you a little bit.