Gila Queen's Guide to Markets
Gila Queen's Guide to Markets is a market newsletter I've relied on for a long time; it covers a lot of territory. While the April issue focuses on poetry, there's also publishing news, dead markets, contests, anthologies, SF/F/H, erotica, and more, plus writing articles. Some issues focus on various themed publications, but there's always something for everyone.
The Guide has been around for twenty-one years now, and it used to be in print, along with Scavenger's Newsletter and the Fantasy & Science Fiction Workshop, both of which are no longer around. It is big and comes in four parts, unless you want the pdf version. If you need a marketing guide that is truly useful, check it out at: http://www.gilaqueen.us/