I was immediately intrigued by the concept of WordHustler when I read an article by one of the founders in one of the FundsforWriters newsletters. I'll let their own front page speak for them:
"With WordHustler, you can spend more time writing because we simplify, streamline, and organize the entire submission process for you. Not only that, we print and ship each manuscript, saving you time, inconvenience, and money!"
They also keep a database of over 3,000 literary markets that is completely free. Just scroll down to the bottom of the front page and click on the obvious link.