Welcome to the One Laptop per Child wiki. Please make yourself at home; read through the Table of Contents and FAQ, and take a look around. If you need a general wiki-tutorial, Wikieducator has some excellent ones. We also hang out on IRC - my nick is mchua, and I am often around #olpc-content.
Some possible pages of interest:
Check your preferences and be sure you verify your email address and turn on email notification if you'd like it -- you can find out when your talk page, or any page on your watchlist, is modified. You may want to upload a photo or information about yourself to your userpage (see Lauren's and Xavi's pages for good examples).
If you have a particular interest or project in mind, go ahead and start it! Feel free to leave me a note on my talk page if you have further questions, need help finding your way around, have a cool idea for a project, or just want to chat. You can also call, text, or email me anytime; contact information is on my user page.
Glad to have you here!
PS - Actually, Andy - do check out IRC... or somehow get on chat, because there are a ton of things I want to talk with you about.