Our library (Hampshire, UK) initially only supported Adobe DRM format for loans.
They now seem to support Overdrive Read as well, I think that is for reading direct from the browser?
No sign of any Kindle support.
It seems lots of US public libraries support Kindle, but not many UK ones. Where are you?
My main concern with Adobe is that they provide this relatively 'open' infrastructure,
but their support for it is absolutely atrocious; replacing second-rate ADE 1.7.2 with third-rate (fourth-rate?) ADE 2.0 and 2.0.1.