S8DS is more or less a port of SMSAdvance to the NDS. It emulates the Sega Master System and the Sega Game Gear.
The biggest difference from the SMSAdvance is probably that you don’t have to use a builder to add roms, you can use zipped files directly and the screen doesn’t have to be scaled to fit.
Changes:
*Added R as FastForward.
*Fixed Bios handling on MD (Frogger proto GG2SMS works).
*Fixed “Border Off” for GG.
*Sprite collision is now “On” by default.
*Changed R as GG start to X as GG Start.
Thanks to http://gbatemp.net/index.php?showtopic=188675 and http://www.nintendomax.com/index.php?topic_id=10793 for the news.