FotoFlexer and Picnik were clear standouts--and Picnik's uncommonly well-done interface gave it the edge. When you need to quickly tweak a picture on a photo site (or on a PC with no desktop image editing application), it's productive and fun to go...

Enter a new breed of photo editors that not only leverage the Web but live on it--browser-based services you can use on any PC with an Internet connection. These Web tools let you directly edit images on photo-sharing sites and social networks, so it's...