I'm kind of a "casual buddhist" myself. I'd be happy to explain what I can. Buddhanet, as the above poster linked to - is a great resource.
The funny thing about buddhism, is that it is in some ways more of a philosophy than a religion if that makes sense (though the Mahayana schools tend to be more dogmatic and religious like)
I myself, find that it blends well with pagan ideas, and I even know a couple people who consider themselves buddhist christians if you can believe that!
Threre are a few good "primer" books out there I've read also. I'd recommend What Makes you NOT a Buddhist by Dzongsar Jamyang Khyentse or if you like a more irreverent memoir type style, Hardcore Zen by Brad Warner is a fun read!
I also really recommend reading the Great Heart Sutra - whether interested in Buddhism or not - it's a beautiful piece! Here's a link to a version that's both easy to understand and beautifully written: http://www.fodian.net/English/HeartSutra.pdf