That Forth box sounds cool. If I recall correctly, Raskin originally wanted the Macintosh (i.e. the pre-GUI Macintosh) to be based upon a similar processor and be programmable in Forth. Forth was once viewed as the pancea for computers for the masses: an easy programming language for anyone. Not that I've had much luck learning stack based languages like Forth and PostScript. There are a couple of cool Forth interpreters for the Mac though. One of which is MOPS (and PowerMops for the PowerPC).

Have fun.