I found http://lygte-info.dk/ (website about batteries, chargers, and more stuff like that) through a search engine when looking for specific information about a LiIon cell. But then I started clicking through that maze of links and found so much useful information that I would never have thought of searching for. I spent hours "trapped" on that page.

The navigation is crappy (randomly interlinked handwritten HTML-pages) but the content makes up for it. The article by tttthis very much resonated with me. Many modern sites look great but don't have all that much actual content.