Here's an excellent new free resource:

"The AA Independent Press Guide is a detailed guide to over 2,000 literary and genre magazines and publishers from around the world. It also includes links to over 700 internet magazines, and now houses links pages to writers' and artists' web pages and writers' resources. It is, as far as I'm aware, the most extensive guide of its kind, and it can be accessed for free at my website, which is at http://www.thunderburst.co.uk"