Philip Athans, the managing editor for novels at Wizards of the Coast, has just put together an extensive and extremely useful book for aspiring authors in SF/F, The Guide to Writing Fantasy and Science Fiction.  He did extensive interviews with me, R.A. Salvatore, Mike Resnick, Terry Brooks, and other bestselling, award-winning authors to develop an extensive guidebook on all aspects of developing, writing, and publishing in the genre.  Storytelling, Characters, Worldbuilding, Details, Nuts & Bolts, Polishing, as well as a whole section on business.  R. A. Salvatore even provides a new, unpublished story for a complete deconstruction and analysis.

A very useful guide for aspiring writers.  Phil Athans also has a lot of useful information on his regular blog, http://fantasyhandbook.wordpress.com/