Beyond some fairly mediocre contributions, I haven't made a huge dent yet in the English Wikipedia, and I've mentioned that before. One of the things I noticed a while back, but think is pretty cool is that the Spanish Wikipedia contributors have incorporated my ideas from my discussion on Django Architecture into the Spanish Wikipedia article on the Django Web Framework. I've been getting a fair amount of hits from that usage.
As a note to myself, and a potential way to guide potential contributions, I should join the Louisville WikiProject when I get a chance...