Some people have cooler websites than I do, here is some of the ones I think you should check out if you don't know them yet.
Navy Electricity and Electronics Training SeriesNavy training manuals about electronics downloadable as PDF format. A great place to start learning about electronics, even though these are old documents most of it is still very relevant and they are well written and easy to read.
Mike's Electric StuffThis guy does cool things with electronics, and has a very entertaining YouTube channel here.
TubeCrafterWebsite of the brilliant Ron Soyland, who creates his own vacuum tubes and other interesting stuff. He also has a wonderful YouTube channel here.
Sci.Electronics.Repair FAQOften a great resource if you have something that is not working, along with a service manual if you can find one :-).
Paul Falstad's WebsiteHas a bunch of cool Java applets sir Falstad wrote. In particular I find the circuit simulator applet useful for testing or explaining simple ideas as it has a much less boring workflow than SPICE simulations and the likes (albeit it is somewhat limited).