Another Triple-Boot Windows 7 thread (it's different, I swear!)

Question

I've got a previous generation Macbook Pro (not unibody) 120 GB Hard Drive with the following setup for OS/Disk space:
OSX = 71 GB
Windows XP SP3 = 40 GB
...and I would like to make it this setup:
OSX = 61 GB
Windows 7 Beta = 10 GB
Windows XP SP3 = 40 GB
...preferably without remaking the Windows XP SP3 install. I don't care if I need to boot between OSX and Windows and then choose XP or Windows 7, but I'd really like the 2 Windows OS's to be on seperate partitions, and the Windows 7 Beta partition to be removable.
This discussions gives a walkthrough of something similar to what I want to try:
http://discussions.apple.com/thread.jspa?threadID=1853851
...except I have 3 quick questions, both the the author and to the general public:
1) Does his instructions hold the same for Windows XP with Windows 7, and not just Windows Vista with Windows 7
2) Can I do this without having to re-setup my Windows XP partition, and
3) Can I later remove my Windows 7 parition (and add the space to my OSX partition)
Thank you very much,
- Keith =D

Answer 1

According to the replies, I can do exactly what I wish by following these instrctions:
http://discussions.apple.com/thread.jspa?threadID=1853851&tstart=15
...except doing it with Windows XP instead of Vista.