This isn't strictly romhacking related, but I've released a tool for viewing and decoding most of the multimedia files in Digital Pictures' games for the Sega Mega CD/32X, for example Night Trap
and Sewer Shark
. It's called SCAT (SGA Converter and Analysis Tool), which is also a reference to the first game to use the SGA format (bonus nerd points to anyone who gets the reference
Please check out the project page on SourceForge
if you're interested.
Also, I'd be happy to hear from anybody who has experience cracking compression schemes. There's one encoding format used in DP games that I haven't been able to figure out yet, but if I can get some help with it, SCAT might one day become a complete decoding solution.