I recollect hearing Jeff/Joel say in one of the podcasts that their primary use case when designing Stack Overflow was someone typing a question into Google, seeing a Stack Overflow page as the first hit, clicking on the link, and getting the answer.
I'm saying this at work an awful lot lately, that as website designers this is the most important workflow for our customers. We know from our traffic analytics that this is what is happening, but not everybody has internalized what this means in turns of site design. I'm attributing this to Jeff/Joel, but I'm not sure I'm remembering this correctly.
Can someone help me find this quote? A search of the transcript Wiki hasn't turned it up.