DS-Homebrew/nds-bootstrap v0.64.0 on GitHub

Instructions:

DSiWare playability on DS Phat/Lite is finally out of it's proof-of-concept stage, as you can now save your data, along with 100 titles now supported (plus a few more, if you're using a DS Debug console)!
- A custom .sav format is used for flashcard DSiWare save files (featuring a "save exist" flag and save size at the end of the file).
- Shantae: Risky's Revenge can now get past the first two battles using an existing save file!
- Scroll down to see which titles are now supported to play on DS Phat/Lite.

Communication errors should no longer occur in games with local multiplayer (ex. Mario Kart DS)!
Certain DS games no longer have issues with TWL clock speed!
Fixed some pre-loadable ROMs not booting (ex. Clubhouse Games).
Fixed some pre-loaded ROMs with the expanded space not reading split data properly.
- Mario Kart DS no longer crashes when starting the Mushroom Cup.
Fixed more DS games with weird arm9 start address not booting (ex. Spider-Man 2, Urusei Yatsura: Endless Summer, etc.).
Other minor fixes.

Not all DSiWare titles can save on the DS Phat/Lite, due to the difficulty of adding save support for them, and/or them storing more than one file in the save filesystem.
WarioWare: Touched! (DSiWare DL version) does not play audio on both DS retail and debug models due to it taking more than 4MB/8MB of RAM, using almost of the DSi's RAM.

Newly supported DSiWare titles on retail & debug DS consoles

Click here for the full list.