Don't think this has been posted here yet but over on Cloudy Nights they have posted a link to a free Astrophotography Primer for download. 155 pages pdf file but full of excellent practical advice. It's about 10.6 megs.
http://www.astro.uwo.ca/~rasc/articl...Proper_Kit.pdf
Definitely worth looking at for aspiring astrophotogs like me ...!!