I'm familiar enough with Forth, picked it up in the 80's with Blazin' Forth on a C64 with Leo Brodie's book at my side. Played a little with the boot environment on some Sun boxes, made some simple contributions to another Forth project on x86 that I can't remember the name of. I never got the wide-eyed wonder some people seem to have about it though, let alone saw it as a silver bullet. The tax bracket code at the bottom of the article is a pretty good illustration of why: it's a really elegant sort of macro assembler, but I'm not really interested in writing whole apps in macro assembly.