Amazon today only: Flip MinoHD video camera $119.99 (40% off)
I don't think anyone wonders about the usefulness of a palm-sized video camera. This Flip films in HD and makes taking videos as easy as grabbing your cell phone. The Flip MinoHD is Amazon's Deal of the Day, so it's extra-discounted: $119.99 (40% off the list price of $199.99).
Amazon's also got two special offers running for electronics and cameras -- with this purchase, you get a free 1-year subscription to Wired magazine, and a free 12-month photo calendar from Shutterfly.