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A good next step up from Mims would probably be the ARRL Handbook. After that, or possibly concurrently with it, Horowitz and Hill's Art of Electronics 3rd ed. would be worth looking into.

I've heard good things about Practical Electronics for Inventors as well but haven't actually seen a copy.

'Getting Started in Electronics" is the Mims book for people who are learning from scratch. His notebooks are meant more as reminders for stuff you already know.

Visit adafruit site. They are very high quality and oriented towards teaching people electronics and basic microcontrollers. A bit pricy, but I find their boards, documentation, etc., to be consistently high quality.