Ebooks distributor OverDrive is expanding its online catalog to include MP3 audiobooks, the company told us. Publishers who are participating in OverDrive’s audiobooks program include Random House Audio, Blackstone Audiobooks, Hachette Book Group and Books in Motion, among others. The MP3 titles, which naturally come without copy protection software, will be added to OverDrive’s existing catalog of roughly 20,000 DRM-protected digital audiobooks and over 100,000 eBooks. 

Borders is the first bookseller to agree to sell OverDrive’s MP3 at its dedicated Borders Audiobooks channel. For Borders, this is one more initiative that it hopes will round out its website, which is concluding a digital overhaul by the end of this month. OverDrive’s audiobooks, however, won’t be available until May.