Duotrope’s Digest looks like a good resource.
Welcome to Duotrope’s Digest, a database of over 1175 current markets for short fiction and poetry. Use this page to search for fiction markets that may make a fine home for that short story or poem you just finished. Use the menus at the top and right to explore the rest of the free services we offer writers and editors, including a free online submissions tracker for registered users.
We update about once a day, and we check all the listings at least once a week to ensure the most up-to-date database possible.