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Actually, it turned out to be that Parallels had un-checked "Windows Taskbar: relocate automatically". Checking that option solved the problem.
Problem solved. For some reason, Parallels decided to un-check "use multiple monitors" in the settings all on its own. Weird.
I've had XP set to open on my second display...pretty much forever. Now, though, after updating OSX to 10.5.7, it'll only open on the first...