So we all know about Wikipedia, right? Great source of info on just about any topic under the sun. But we all want to know: WHO'S NOW?? Well catch rising star Wikihow on its meteoric ascent to the top! Okay, maybe not the top, but it's the same idea as Wikipedia, only in a how-to format. Some of them are really too basic, but if you have no idea how to do something, this isn't a bad place to start. Learn how to build a tower of cards, make empanadas, or restore an abandoned cemetary! Check out the most popular pages for a good idea of what info geeks are looking up (most popular article: how to french kiss! Holding in at #2 - how to get ROCK HARD ABS...here's a tip - less Cheetos).
Oh, but it's no substitute for wikibooks. If you haven't read these, some of them are REALLY great.