Welcome to MR (MobileRead), Dave, and congratulations on your new Kindle.
MR has a great
Kindle forum you have probably already discovered. Check out the top of that forum for lots of sticky threads with additional information and links.
We also have lots of free, beautifully hand-formatted, and proofed PD books in the "
E-Book Uploads - Patricia Clark Memorial Library". Very dedicated MR members have spent time doing this for us to enjoy. You can check out the selection in the
Mobi/PRC section for your kindle.
MR also has a great
wiki for additional information. You can read about
ADE (Adobe Digital Editions),
DRM (Digital Rights Management), and even about the
different formats.
Enjoy exploring the forums and just ask if you have any questions.