I'm compiling a jargon file for the website and for the magazine's disc. In case anyone has any suggestions, I've set it up as a Google Doc that anyone can comment on. I'd love to see comments on my definitions and ideas for definitions that I've missed.
Note that it's still lacking lots of definitions! I decided on the initial definitions to suit the topics in next month's newbie guide, but I'm going to try and expand it to cover as much strange terminology and as many awkward acronyms as possible over the next few weeks.
Update: The Jargon File is now available. With a bit of luck, we'll continue to update, expand and improve it as time goes by. Thanks for all your feedback and suggestions!