Here are the Dark Sun archives from the WotC forum (click the link). They were originally rescued by Soularen, but the files were not in a human searchable format, and the project to categorise and host the archive was ultimately abandoned. In the last year, I have learnt a lot about coding and creating tools, so I have been able to rescue the forum and put it online. The entire forum, not just the Dark Sun material, is there. You can sort by file size so you can find the biggest threads if you wish. Have fun.
May 4 2025: The archive is currently down due to a SpamHaus false positive. It is incredible the power SpamHaus has over the internet, and the fear that they instill in webhosts and registrars. I am amazed.
May 13 2025: Service has been restored. SpamHaus has a veto on the internet, and it was quite stressful.