It depends on the title. I'm reading Karen Millers "The Prodigal Mage" and I'm interested in the sequel. It seems that not all of the books are downloadable. After looking at the product page from Google, here's what you see:
http://books.google.com/support/bin/...=1061545&hl=en
Here's the product page:
http://books.google.com/ebooks?id=Lp...store_bookcard