I already posted about it on a different thread here, but why not twice?
Lara Adrian is giving away KISS OF MIDNIGHT, the first of her Midnight Breed series, as a free download in the formats PDF, Sony Reader, Scribd and for Kindle.
http://www.randomhouse.com/bantamdell/laraadrian/
And I know it's open domain, but for some classic romance fix (Austen, Heyer, Gaskell, etc.) I go to
http://girlebooks.com/
It a beautiful site from a dedicated editrix.