Some of you already know this, but myself and a few friends review books dealing with enlightenment on our blog
anyway
people keep pointing out that we don't have any reviews yet dealing with YOGA as a path - one of our reviewers (Autumn) has done yoga most of her life and would be willing to read something for review
then there is the extended list given by Yogani (one of the greatest pointers ever), which pretty much covers most of the good yoga and spiritual books out there: http://www.aypsite.org/booklist.html