From OverDrive's Digital Library Blog:
November 23rd, 2011 Brianne Carlon
‘Get for Kindle’ for all Penguin eBooks in your catalog has been restored as of this morning. Penguin titles are available for check out by Kindle users and the Kindle format will be available for patrons who are currently on a waiting list for a Penguin title. Upcoming releases remain unavailable.
We apologize for the inconvenience this caused for your library and patrons.
At this time, no further information is available. We hope to share more details in the near future.