Ah, I see Ambassador Butler has made a resurgence :P.
My most-visited hub has about 25,500 hits on it right now. The funny thing is, I wrote that one because one of my friends asked me the question and I decided to go ahead and write the article. It's on a very obscure topic that can't apply to most people in high-population areas, and I've also never promoted it. It ended up #1 in Google for all five of its keywords (bumped to #3 on the most-searched term briefly after the algorithm change, but it's back now) and generally gets between 50 and 195 hits a day. Even better, it is responsible for well over $150 in Adsense earnings and about another $70 in Amazon sales. There are a few sales from eBay that, given the category, I suspect were from that one too, but no real way to know for sure.
While I won't say exactly which one it is, it certainly does say something about the power of long tail marketing. All of my top ten articles are geared to very specific, though very small niches. Of those, only a couple of them were truly researched for keywords, etc. (contrary to my own best practices and the advice I give other people) and only one has been promoted much at all by me. A couple of them have been linked in other people's blogs and such, but I only found those when I checked for backlinks with SEO Quake.