This is right that many people feel obliged to use Photoshop to manage their photo images. But in most cases, nearly any other tool would be as good. I think first about the excellent IrfanView which is free and does a lot of digital photo management.
But it is also true that if you really want to use all of the xtensive feature set of Photoshop or if you appreaciate its rich interface (defintely well-thought with the user in mind), The Gimp will not be enough for your photographer needs. Here comes the a really surprising software program: Pixlr.
It essentially took the Photoshop interface ideas (really VERY similar to Photoshop), it is a software application written by Ola Sevandersson to be used online (but still in beta status). Nothing to download, free (as in free beer), legal, operating damn well.
What is also notable is that it is available with an interface customized in different languages (including English, of course, and 10 others).