Duotrope's Digest

Via a discussion at the Metaxucafe Forums, I discovered an amazing tool: Duotrope's Digest, which bills itself as "Markets for Writers", but I can also see it as a useful tool for readers who are curious to find magazines, journals, and publishers they haven't encountered before.

For writers, indeed, this is a treasure-trove, providing detailed information on a stunning variety of publications. It's also got a great search engine that lets you filter results by all sorts of different criteria, including genre, length, media, payscale, submission type, country, theme issues, and even what awards the publisher nominates for. The site claims to update daily, with every market checked at least once a week.