I was afraid of that. It's probably possible, but I have never touched any Microsoft "Home" product. More likely it is possible with the 7 Home Premium release.

Is there someone out there with Windows 7 Home Premium who can tell 420 if he can share a drive, and how you do it?

If you can share the laptop drive to your network, you can enter its address in the XP machine's explorer window (file browser, not internet browser) and just drag and drop files to wherever you want.

Also, I believe that Microsoft client OS's (as you have) come with an ability to "migrate" your files to a new machine. I've never used that feature though, so I can't tell you how it works. Or if it works.