Hoocap has a new product that combines a lens hood and a lens cap into one clever device. The pictured Hoocap is for the Sony NEX 16mm lens, but the company is developing also similar products for Leica, Canon and Nikon lenses. The Hoocap is available on eBay for $49 (currently only for Canon lenses).
Here is a demo of the Hoocap HB77B for Nikon DX 17-55mm f/2.8 lens:
Via Photoclubalpha