So guess what? bubble2k has just released SnezziDS v0.28, the DS port of the Snezziboy SNES emulator. This update fixes a few things that bugged the previous version plus some added features including:

* Overhauled the graphics engine to make use of the DS VRAM
* Implemented Mosaic effect
* Aligned the SNES ROM to 64KB boundary
* Modified Snezzi builder to allow building of 32Kbyte ROMs
* Reallocated memory to various parts of the ITCM/DTCM/VRAM
* Implemented line-by-line mechanism for the following graphic registers
* Fixed Megaman7/XMen speed problems by protecting the ROM region, and allowing only Read access
* Implemented delayed NMI/IRQ triggered

Those are just some of the improvements bubble2k did. You can read the whole list in the release notes included in the download file.