As I am looking into a couple electronics projects I have turned up a handful of fantastic resources on the web. Here they are in no particular order.

Suppliers:

    Jameco - Broad selection of electronic supplies. Good service, includes pictures, great prices. These guys are my current favorite.
    Digi-Key - Has some stuff Jameco doesn’t. Prices are a bit higher in general, but good service. No pictures. Poorly organized site.

Reference:

    The Hardware Book - A great reference for cable and adapter pinouts. Some common, most hard to find.

Projects:

    Play-Hookey - Fantastic, step-by-step instructions on a logical series of electronics experiments. Includes great information and instructionals on logic, electricity, analog circuits, and even optics. This site is definitely a great starting point!
    Bowden’s Hobby Circuit - A wide variety of projects. Great schematics, nice explainations, but not much for step-by-step.

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