NEWS - Petit Computer "a DSiWare app that allows you to program your own games"

- Developed by Sapporo-based Smile Boom

- DSiWare

- program games using the BASIC programming language

- create programs using a text editor

- features on-screen keyboard

- 13 built in tools for creating character visuals, background map data, graphics and more

- seven sample programs and three sample games

- send out your program to others

- 800 Nintendo Points

- due out on March 9th

official site here

More screens here

Thanks to GoNintendo
I couldn't find any rating for this at ESRB, but i'm pretty sure it will be a E or E10.
-Dustin