This is going to be released June 21st. Who knows if it'll be any good, but I'm excited to find out. Like you noted, the Apple documentation is pretty awful. Good luck!
Nice, definitely getting this. Hopefully it covers audio units.
My advice as a CA newbie would be to read Apple's documentation from their SDK, read through the SDK code, and search the Core Audio mailing list at lists.apple.com (lots of good info there).
Ack, no kidding. I made a tiny iphone app for my fiance and Valentines day, and I had to make 3x 20second audio clips and fire NSTimers to play them in order. Because I couldn't find any easy to modify sample code or classes to play a longer than 30second audio clip.