AOL abruptly terminated their web hosting service (with only the legally required 30d notice), which is why my home page has disappeared, with no way to re-direct the broken links -- terrible, irresponsible. I have now moved my book to:

http://www.pianopractice.org/

the site is not yet complete, but at least you know where it is.
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Fundamentals of Piano Practice: http://www.pianopractice.org/