TeraCopy
Most people find the Windows XP copy function sadly lacking. If even a single file can’t be copied, the entire operation fails. Vista fixes most problems like that, but XP users are sadly left out. There is a third-party solution. It’s called TeraCopy.
Teracopy can do everything the XP copy/move can do, and so much more. It lets you queue operations, adjust the buffers, and easily pause/resume file transfers. If it encounters an error, it pauses and lets you decide what to do, and doesn’t abort the entire operation like XP does.
In my experience, it works great with XP, but it’s somewhat quirky with Vista. It’s freeware, so it’s definitely worth checking out. If you want more features, you can get the Pro version for roughly $30 depending on exchange rates.