It appears someone ported Gambit to the Android...
http://seanchapel.blogspot.com/2010/10/gambit-scheme-on-android.html
Sean Chapel, if you are listening... can you make a reasonably clean patch I can add to the Gambit distribution? That way interested users will be able to compile Gambit on the Android "out-of-the-box". Also... did you get TCP networking to work? This would be useful for remote debugging.
Marc