In the beginning, there was Adobe Photoshop, an industrial-strength desktop application that was followed by cheaper, more consumer-oriented photo editors such as Photoshop Elements and Corel Paint Shop Pro. But the newest image editors on the block are free browser-based services that provide the basics, and sometimes a lot more. None of them render desktop software obsolete, but they're well-integrated with photo-sharing sites such as Facebook, Flickr, and Picasa Web Albums, and you can't beat the price. Of the six in this review (presented in order of best to worst), I chose Picnik as PC World's Best Bet; FotoFlexer wasn't far behind.
Look for our chart of these online editors and our roundup review; both also have links to our reviews of each service.