Today only: Amazon has the Seagate Expansion 500GB Portable USB Hard Drive, model no. ST905004EXA101-RK, for $59.99 (89 – 29.01) with Free Shipping for a limited time. Deal expires October 4, 2010.

Seagate External Portable drives are ideal for people who want lots of storage they can take with them at a moment’s notice. They’re automatically recognized by Windows Vista and Windows XP—no software to install. And because they draw their power from your computer’s USB 2.0 port, all you have to do is plug in the single USB cable and you’re ready to go. This drive can also be reformatted to be used on Macs with OSX.