I'm not connected with this site, but its a new site covering a few Geocaching related things (including getting started etc). This seemed the right thread to add it too.
www.geocacherscompass.com - Created by Mark and Stacie Weber and Chris Farris. You will not only find information here, but step-by-step instructions about how to Geocache and other related subjects.
What is this site? This is a series of links to pages, which help you solve our (and other) puzzle caches. As a first tip, have a look at the solving puzzles section, which gives an overview of the whole thing. Also hover the cursor over the links on the left and you will find lots of other useful stuff.
There are also hints for all or our puzzles, and even worked solutions for some of them if you are really stuck. Last but not least there are maps showing where our caches are, so if you can't be bothered with puzzles but want to try your cacher's eye, you can try finding them that way.
Please visit the guestbook and let me know what you think of this whole thing - please keep it polite! There are also links for facebook and twitter above.
GeoLeaks is active since the end of 2010 with a forum for solving especially mystery, multi-mystery, tradtional caches with additional commands, Letterbox hybrid and armchair caches inside and outside the Netherlands with emphasis on the Dutch language area. Also outside of this area we get more and more solutions, in the rest of Europe, but also for the rest of the world.
There is this PDF document on the site, looks very useful: GC Code Book