Well fable, I'm working on a conversion to replace the whole SoA storyline for a comp with ToB installed. It's a big proect, yes far from completion and I only have one person working with me but we are making steady progress. You can see some details on my website (link in sig
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Apart from that, Minto, one of the makers of TDD is working on a total conversion where you also start with a new character.
Potencius the other maker of TDD is also working on a TC, a Dragonlance themed one I believe.
Other than that there are several smaller MODs in the making such as TheMindsEye's Legends of Deepwater (great new area graphics).