Picturestation | Royalty-free pictures
It's very hard to find reasonably priced pics for use in web design, digital work, etc....sure you can go to PhotoDisc and end up spending $30-200 per picture, but only if the client it shelling out for it.
Enter PictureStation. The premise is simple...for every 1 photo that you upload, you can download 2. The quality is generally pretty good (with exceptions, of course) and there is a growing database of images and categories.
No restrictions on personal or commercial use either.