GameYob v0.4.1 is released. GameYob is an open-source gameboy emulator for the DS. It has excellent compatibility and speed, and runs many games flawlessly. Notably, it can use the Gameboy Color bios to colorize pre-color games, just like on a real gameboy.

GameYob v0.3.1 Changelog:
- Fixed "save" button (which was bugged) and reduced autosaving lag

Download: GameYob v0.4.1
Source: Here