Over the last few weeks I've been working on a cross-reference for Smyth's Greek Grammar. It is now available at http://www.greekgeek.org. Look for it in the table of contents frame.
The xref tries to relate each of Smyth's text citations to the Grammar's paragraphs. So...if you've ever wondered, "Does Smyth have anything to say about this line of Thucydides?", you can now find out.
As I state ...