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Shameless plug, but I try to explain math concepts on my blog. Here's an example for e, which eluded me for a while: http://betterexplained.com/articles/an-intuitive-guide-to-ex... My goal is to explain ideas as I wish they were shared with me: informally, with the primary focus on intuition (there are plenty of places to practice the mechanics). Hopefully it can come in useful for you.
I just wanted to say that your explanation for e is excellently done. I found it incredibly helpful - it was exactly the kind of intuitive, step-by-step explanation I was looking for. I hope that you're planning on releasing more content.
Thanks, really glad it was helpful. I'm planning on going back and covering all the math I thought I'd learned in school :).