I had recommended another site a while back and later on, while trying it, I discovered that they expected you to email your photographs to them and they would correct them for a fee!!
Well this one is just what you need. upload your photograph from your desktop or Flickr account and make some basic changes - rotating, lighten, brighten, change contrast, crop, red eye reduction, teeth whitening :P etc.. I tried it out with a photograph of mine from Flickr. Nice Results. And like quite a few other things on the web nowadays it is free :)