♦ Duotrope's Digest - great search engine for many genres and constantly updated

♦ Story Pilot's Science Fiction & Fantasy Market Engine - this site has a useful search engine that you can plug the specs of your story into and come up with suggested markets

♦ Agent Query - good place to search for agent listings

♦ Submitting to the Black Hole - you can take a look and see what the response times are in certain SF/F/H markets

♦ Preditors & Editors - this is the best place to look to make sure that agents and publishers you're considering submitting to aren't shady

♦ Absolute Write - this is a great place to keep up with current trends and to find out what's going on in the publishing world - the forums are a wealth of information, especially the area that discusses literary agencies