I had an idea over a year ago and posted it to Usenet. That thread pointed me to Wikipedia, which I immediately hailed as the answer to my dreams. By the next day I had forgotten about it.
Later on, though, I found my way back, time and again, and finally actually registered. Wikipedia, however, was not exactly what I was looking for. Wikibooks is.
I'll probably spend the most time in the Mathematics section. That and computer science are my fortés. I've always wanted to use the word forté. I think I've used it wrong.