Over at AllRomance Books, the Ravenous Romance imprint is giving away 10 free titles for a limited time as some sort of special promotion. They seem to be all erotica, and available in your choice of Mobipocket, Adobe PDF, and ePub, DRM-free on the ones I tried loading up.
Anthologies
Men in Shorts ed. Lori Perkins.
Wicked Pleasures: Stories of Kinky Love ed. Cecilia Tan. BDSM.
Contemporary
Making a Scene, by Trudy Doyle.
Ripping the Bodice, by Inara Lavey.
Saving Sophie, by Elle Amery
Fantasy
Magic University: The Siren and the Sword (Book One) by Cecilia Tan. Urban (or rather, college town) fantasy.
Historical
Force My Hand, by Em Brown. Regency.
Paranormal
The Darkness and the Night: Blood and Coffee, by Lisa Lane. Vampires.
Mystery/Suspense
Wonderland, by Adam Carpenter. Gay.
You can only choose to download 1 of the various formats after "purchase", so if you want to be able to download in another, you'll have to "re-buy" the book by adding it to your cart again.
Also, the checkout process has a lot of pages to go through, so keep clicking until you receive confirmation and can see the titles in your library.