Summary: Attractive, easy-to-use controls and decent output quality might be enough to recommend the HP Photosmart C4780 - if the cost of ink weren't so high. It could be a good choice if you need wireless and don't print much.
Conclusion: It's clear from out tests and living with the C4780 that it's a "I've got a printer for the odd print" kind of printer rather than aimed at someone who still believes in paper. The standard document printing is good enough for the odd letter, homework, or document you want to reference and the photo...
Pros: Cheap, once set-up easy to run, works with iPrint iPhone app
Cons: Have to hardwire connect it to set-up wireless, no paper catch tray, small LCD screen, memory card reader doesn't support Compact Flash