I'm covering official WotC publications, as well as anything published under some sort of licence. So the Ashes of Athas releases definitely count. They are already in the Dark Sun guide, so [MENTION=11365]Alphastream[/MENTION] is just suggesting that they also belong here.
In general, I've tried to leave the setting-specific stuff out of the 1e/2e/3e/4e Collector's Guides to avoid too much duplication. There are a few exceptions, including a large amount of FR 4e content in this Guide because the FR Guide isn't finished yet. I'm still pondering Alphastream's suggestion, but will either add the AoA modules or a note mentioning them the next time this one gets updated.