As Peter Knaggs suggested on the EuroForth 2008: The only way to completly understand Forth, is to implement it by yourself, and as i'm eager to learn every bit of Forth, i started implementing my own Forth-compiler.
Bruteforth is implemented in Forth ( using GForth ) and should be able to compile itself one day ;)

Currently i focus on the GForth-C-Interface but as soon as bruteforth is able to define new functions by itself, i'll be putting it online right here.