EclipseOn Mac OS X
However, getting syntax highlighting working doesn't work on 2.2 (feb 2012). If you actually manage to get scion-browser and build wrapper compiled, then your code will probably stop compiling in the IDE. So just live without those features for now or you can burn a lot of time.
In the meantime, you get good edit/compile/build with EclipseFP 2.2.2.
These instructions are applicable to EclipseFp 2.2.2 and Lion, and probably apply to other versions of OS X and EclipseFP.