I found an interesting article in a local London (UK) paper. The London Borough of Barnet are boasting that they've lent 1k ebooks in the 3 months their digital library has been in operation. That's quite an impressive figure, given that they only have 585 ebook titles listed. The digital library is provided in partnership with Overdrive, and the supported formats include Adobe DE Epub and PDF.
Overdrive has partnerships with digital libraries in 11 countries. Is your local library is one of them? If you're not sure, you can check the Overdrive website. They have a searchable list of all library partners.