If you want a pain-free way to unload unwanted gadgets, you could do worse than to check out Second Rotation. This online middle man gives you cash for your old or unused devices. You just look up your gadget on the site's online price guide to determine the trade-in value, then package and ship the device free of charge. Once the folks at Second Rotation receive it, they'll evaluate it and send you your money via check or PayPal. Not surprisingly, hot items include digital cameras, camcorders, cell phones, GPS systems and MP3 players.