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CoverBuddy is a cute piece of software that makes your PSP somewhat useful. Using your Wi-Fi network, you can access iTunes and control it with your PSP. It's $20 and works with Mac OS X, though a Windows version is planned. Could be worth the bucks if you are wandering around your house a lot, don't have SONOS, and spent the cash on a PSP expecting fun things.

PSP = iTunes Remote [DAPreview via Binary Bonsai]

Prices and reviews for Sony PSP [CNET]