That's an interesting point, though pre 2001-ish I'd suggest this was easier. Usenet was the obvious destination. Groups like comp.lang.c, comp.lang.basic.misc and rec.game.design were popular and easy to find. Nowadays, there are 1001 different sites (many with poor traffic) for every topic imaginable.
Sadly, Usenet seemed to fall on its ass and be usurped by the Web somewhere between 2000 and 2003. A shame, that.