I love Wikipedia but I admit, I mostly use it for personal “research” (film oeuvre of Will Farrell, history of punk music in America, list of The Red Green Show episodes, etc.). However, there are a lot of great resources on Wikipedia for software development/IT in general, and software testing in particular. There’s a whole portal for software testing, in fact. I enjoyed the photograph of what might be the first “bug” ever discovered in software.
Wikipedia Portal: Software Testing