OverDrive has released updates to their mobile site. Patrons can now enjoy the :

• Patron-defined lending allows patrons to choose their lending period for each title. Example options include 7, 14, or 21 days.
• Advanced search functionality gives your patrons the opportunity to search by criteria such as title, author, keyword, publisher, format, etc. for a more custom set of results.
• Enhanced searching allows your patron to search within results to narrow down a list of titles, and additionally, limit the results to only show titles with copies available. This means no more scrolling through dozens of pages to find a title available for checkout.
• Page numbers in search results gives patrons a clear view of how many titles were generated in their search or
  browse.

Enjoy!