CNET reviewed the PhotoSmart 475 printer from HP. Here's a short snip from their review:

If you want to be the life of the party, this portable photo factory has everything you need except a lampshade chapeau. Tote the lunchbox-size HP Photosmart 475 GoGo Photo Printer by its convenient carry handle, and set up the 9.5-by-4-by-5-inch, 3.3-pound printer by the poolside--no worries about AC power if you have the optional internal battery. Then crank out borderless 4x6- or 5x7-inch, 4,800x1,200dpi inkjet prints all night with the aid of the multicard reader, a 2.5-inch color preview/menu LCD, and a handheld remote control. When your camera's memory card fills up, you can copy as many as 1,000 images to the printer's built-in 1.5GB hard disk and keep shooting.



Link: CNET