Stock photos, great for inspiration, making color combinations, and of course for making that "contact us" image of the girl/guy with the earset on.
Deemed a search engine for creative commons photos
, everystockphoto pulls images from sources around the web into one place.
This may prove useful, however it depends on how much quantity eats into quality. I tried a few searches and had some strange images returned from Flickr, for example. When searching for location based images, images from Flickr were of people in a given location as opposed to images of the location. Your mileage may vary :-).
The purpose of this site is to provide free image reference material for use in all creative pursuits. This is the world wide web's morguefile
, an interesting idea, and all images are free to use but not to redistribute.
The site has forums and lightbox facility and a bunch of other ancillary stuff, but most importantly the search works decently and otherwise they do break photos down into topics. Not as easy as iStockPhoto, but it is free and there may be some images in here that are less used then those found on the more popular image sites.
From the website: Free Stock photos for designers. You're free to contribute your own photos or take what you need... As a courtesy to the photographer please let them know how and where you use their images, and do not bundle them in a package for redistribution.
Pixel Perfect is a free digital archive (see Terms of Use) with an abundante selection of images (and illustrations) organized by category.