Yep the author of the ngine project has done it again first he ports snes9x to the DC now he is going to port the sega genesis emulator dgen to the DC!!! Here is a snippet from the news post:

Here is the first official news about the second ngine project in the works. It is a port of DGEN, the Genesis emulator for Windows. I have been working on getting the code to compile for about three evenings now, and it will now compile for the Dreamcast with no errors, albeit the tile rendering code had to be commented out for now, as it is in native x86 assembly. Therefore the port currently does not work, but I will try to get the custom tile rendering code up as soon as possible.

He also mentions some stuff about snes9x progress so goto the ngine page for the full post!