The "Webware" blog at CNET has an excellent post about finding how-to-do-it information on the web. For a variety of sites such as eHow, Howcast, and Instructables, the author assesses the quality of the instruction, the level of expertise and authority, and is especially concerned whether there are accompanying videos. You can learn how to do just about anything on sites like these, from tying a tie to installing weather stripping to making sure you follow proper etiquette in China.
While you're at CNET, check out their vast collection of product reviews. This is one of the premier sites for recent consumer-oriented ratings and reviews of all sorts of electronics and high-tech products.