If you've used Bootcamp to install XP on your MacBook or MacBook Pro, you might have been frustrated by not being able to right-click. While shift + f10 will usually work, you might be looking for something more familiar. Apple Mouse Utility will let you use Control-click to right click. Simply place it in your Startup folder, and call it with /s, so that it launches silently on startup.
Also, KeyTweak will allow you to remap your Windows keyboard, useful for reassigning modifiers like Control-C to the Mac's Command-C, etc.
[robg adds: Don't worry, we're not turning into Win XP Hints, despite old April 1st announcements to that effect. But if there are general tips that will help Mac users make their time in Windows more productive, such as this pointer to a couple of very useful apps, we'll run them. What we won't do, however, are run hints regarding using Windows XP itself ("How to configure a wireless connection in XP"). There are lots of places for such help, but we'll continue to focus on hints regarding OS X!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20060527210508277