I haven't bought an O'Reilly paper book in a while, but as a customer, their ebook delivery has been doing a lot of things right for me. They're available in multiple non-DRM formats for computers and e-readers, I get notifications on updates and errata, and they're priced better than the print versions.
Yeah, I absolutely love O'Reilly as a consumer. The prices are great, they use all 4 or 5 major ebook formats, no DRM, "early access" to works in progress (really useful when the current print is on a dated version of the language, but the new edition is not quite done), and they let you "upgrade" a print edition to an electronic version for a very reasonable price.
