Revised: yet another great service ruined by corporate greed… dramatically higher prices, confusing credits.
Huge selection of photo and vector art, good search/lightbox capability, ~~low cost~~, essentially unlimited use (for many purposes), ~~easy pay ‘n download~~.
My favorite feature? Ability to download reasonably clean watermarked comps so we can play around with storyboards and mock-ups until we decide exactly which ones to use.
~~What’s not to like? http://istockphoto.com~~