PrintScreen on a MacBook Pro (using Boot Camp)

Perplexing, I know, but there is an easy workaround. This comes from the the Logic Nest blog, but here it is for good measure as well:

On your MacBook Pro (while booted up in Windows XP), "under the Start menu, select All Programs, then Accessories, then Accessibility, and then On-Screen Keyboard. When you do this the Windows XP on-screen keyboard will appear on your screen. This on-screen utility includes the PrintScreen button (labelled psc in the same position as where the F13 key should be located. That’s it."
Hooray! That worked.