Canon has updated their Selphy portable printers, and for some people a printer that only prints 4x6 pictures might be overkill. But for families I think they're pretty great.
All the Selphy printers use dye-sublimation printing and (in my judgement) make great looking 4x6 prints. Two units the ES3 (on the left) and the ES30 use a cartridge system, which keeps the paper and "ink" (dye really) all in one unit. So there's never a situation where you run out of ink before you run out of paper or vice versa. The CP770 (on the right) and CP760 use a separate dye and paper system. All of them are portable, and they even have features where you can put borders, words and other "creative" things onto the prints - a feature particularly good for kids.
The printers take all forms of cards directly from your camera as well as the Pict Bridge system or a USB connection to your computer. The prints will cost you about $0.28 per print.
Prices range from $99.99 to $199.99. Check them out at USA.Canon.com.
