Lots of listings at New Pages - esp. markets you might not find ont he mainstream newsstands http://newpages.com/
Worldwide Freelance Writers has two databases - one you pay for, but another free one that lists quite a few markets. http://www.worldwidefreelance.com/markets2.htm
Here's another http://www.writemarket.com/
More here: http://www.freelancewriting.com/guidelines/pages/
And I'd always prefer online info. as it's more likely to be up to date than a print directory.
Another way to discover hundreds of publications is to go to Ebsco - an online database that you can probably access through your local library website. Click on the Publications button. Some listings will incude a hot link to the website, but even those that don't will give you a lead you can follow by Googling the publication name and fiinding their website that way.
Also, the Writer's own website includes market listings. But you knew that...
Hope this helps.
LP
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Lois J. Peterson, writer ~ editor ~ instructor
www.lpwordsolutions.com