a very limited version from the obfuscated C contests!
I hope you didn't have to work with the obfuscated source code.
I'm not personally interested in BASIC but it is very popular with many people and might be a way to convert Picaxe and Maximite users to Arduino.
The Maximite has a pretty good interpreter that was/is open source, maybe it's worth porting that across. For that matter there has to be 100s of interpreters around.
Rob