The MagStay Pro is a little plastic clip that holds in your MagSafe power connector on a 15" or 17" MacBook Pro. Basically, it's a retainer that plugs into the USB port next to the MagSafe to keep it from being disconnected. It also allows you to store the little plastic cap that comes with the MagSafe power adapter. Obviously, this completely undermines the point of the MagSafe, but if you find it accidently coming out when using it on your lap, etc., and you're not worried about the cord tripping problem, then it might be worth a look.
The MagStay Pro is $11.99 and is available from thought out.
[via The Gadgeteer]