I wanted to take some time to give a shout out to the folks at Duotrope. This is one of the best services for writers around--for me, it's been an invaluable source of information. The search function alone is worth the cost of membership (which is free, although donations keep it that way). I use their submission tracker, which alerts you when you should query an editor about your submission. Also it's an easy way to keep records of how successful you've been submitting material.
Duotrope keeps track of the acceptance/rejection rate of each publication, as well as how quickly publications respond. For example, I'm not going to bother submitting to a publication that doesn't respond to 25% of submissions they receive. And for some publications, Duotrope offers interviews with the editors, who offer specifics about what they're looking for. It's one of the only lights in the dark forest that is sending out your work. (Ugh, that's a bad metaphor, but you know what I mean--the waiting game sucks!)
Part of the reason I bring this up is it seems that Duotrope is more popular with literary and horror writers than crime fiction writers. The more people who use Duotrope's submissions tracker, the more accurate their numbers are, which is essential to how useful the site is.
So how about you--have you ever used Duotrope?
And for the editors out there, do you think Duotrope is a good thing? Does it just add to the number of bad submissions you receive, or does it help weed out material that doesn't fit?