You may want to add Part #3 in sometime as well. The "install in Windows" option is seen when first placing the live cd in the drive or when browsing to the wubi.exe on the cd you burn.
The other option for setting a dual boot with ubuntu is assigning the mount point "/" to the main root parition and then seeing a new entry added in the 7 BCD using the EasyBCD program's form of NeoGrub which also works quite well. The advantage of the wubi installer however is seeing the latest release installed while in Windows to another partition(root), another hard drive, or even a usb flash drive.
These are a few other options to mention here. Still looks good however!