Peter Hamilton and Tony Ballantyne have their novels released as e-books, encrypted of course in standard formats (mslit and others). You can find them at Fictionwise and presumably other places too.
Charles Stross has a list of his releases including e-books on his site; a good start is here:
http://www.antipope.org/charlie/fiction/faq.html#ebooks
Since drm decisions are not authors to make (see above entry by Mr. Stross), contacting authors about e-books while useful has limited potential in my opinion. When Tor cancelled the Webscription deal, Mr. Stross bluntly answered a question in the Baen Bar about the cancellation, noting that e-books are too little of his earnings to make a fuss about that. And that from someone who is a true supporter of drm free e-books. That's just the way it is...