Did you know Paizo has a link to get to all the various free PDF products people have listed in their store? Neither did I. But here it is! There’s some good stuff in there, for various game systems.
RPGNow has a similar link which is super easy to find, but Paizo’s store is a little more cryptic, so it’s my Gamer Tech Tip Of the Day!
Download them, read them, use them – and if you like them, review them on the site. Publishers give freebies so people can see the quality of their work; if you use a freebie that’s good, say so! It encourages people to buy their stuff and then encourages more freebie giving to you.