My amiga the novelist Leslie Pietrzyk writes that Duotrope's Digest (Markets for Writers) "is an amazing resource... You can search through their database of lit magazines and find out, say, which journals take long stories. Or which journals are closed for the summer. Or what upcoming special theme issues are. All free!" And for those planning on submitting work, I have a bucket of cold water for you (but it's bracing in the best way):
my article on publishing in literary journals.