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Buying a single article from a scientific journal is usually prohibitively expensive if you are not a student or teacher at a school that subscribes to the journal. Most academic journals are available only behind these paywalls, but Deep Dyve just announced a new product that could radically change the marketplace for scientific, technical and medical articles. Until now, Deep Dyve only indexed articles and directed users to the journal's own site. Starting today, users can rent articles from Deep Dyve. Accounts start with a pay-as-you-go account, by which users are charged $0.99 to keep an article for one day, and go up to an unlimited account for $19.99 per month.