this REI site to your list of great resources for beginning geocachers. While there is some very helpful information scattered throughout the geocaching.com website, the information provided by REI supplements gc.com's tutorials quite nicely. It covers just the right amount of detail on topics including geocaching basics, etiquette, what to bring, and even a brief history of the hobby.
REI could have easily turned this site into nothing more than an advertisement page for their GPS receiver products, but they've steered clear of that temptation and instead made this one of the best resources I've seen for new geocachers. Certainly bookmark-worthy.