Wizards of the Coast has allowed Baldman Games to distribute their Ashes of Athas convention games to the non-convention crowd. You'll be able to sign up to receive the chapters over at Baldman's site.
[update: the forum page has gone offline; to request a copy of the adventure, send an email to email@example.com ]
Some important information from their announcements page:
- No one (not even us) can host the adventure files anywhere.
- Only the admins and Baldman Games can provide adventures.
- When you e-mail us (or send us a message via these forums), we will send you adventures, one chapter at a time.
- When contacting us, please include your e-mail so we can send you the files and the chapter(s) you need.
- You can run those adventures, or if you are a convention organizer, you can provide them to your DMs for use at the convention.
- You cannot otherwise redistribute or share or post the files anywhere. If you do, this will likely result in Ashes of Athas distribution being closed down!
- Adventures you received from us can be run anywhere you please (home play, stores, conventions, desert caravans...). You can run them multiple times - whenever you please.
- When you request adventures we will provide a link to pregens, maps, and campaign rules.
I suspect that, by having everyone request directly from the source, Wizards is looking to easily gauge the interest in the game; this is a good thing.