Thanks for the info, Jason. I'm basically interested in looking for books that either have additional topics not usually covered in the standard texts or give some sort of idiosyncratic, but useful, discussion on specific topics. To give you an idea of what I mean, I've been recently perusing through the titles in the IEEE Series on EM Wave Theory.
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Then Kong's book probably fits the bill for you.
In the IEEE series, I really like Collin's "field theory of guided waves" if you are interested in such topics. It is a giant book, but covers a lot of ground that I haven't seen in other textbooks and has a wonderful chapter on Green's functions - the only Green's function discussion that I like better is the one in Dudley's "mathematcal foundations for electromagnetic theory". Elliot's antenna book in the series is also really good, and more "first-principles" than some of the standards.
good luck,
jason