Safari Books Online, an on-demand digital library of books for techies, creative professionals and business folks, has gone mobile. The new service, at m.safaribooksonline.com, lets Safari subscribers take their books with them on their iPhone, Nokia, BlackBerry or Windows Mobile device.

The decision to optimize the library for mobile was almost a necessity for Safari, which says that 81% of its customers use their mobile devices to read reference books and other professional content.

Mobile users can search, bookmark and set favorites and also use preset access keys to launch a variety of functions, similar to "hot keys" on a computer keyboard.

Safari Books Online's library includes books from dozens of publishers including Prentice Hall Professional, O'Reilly, Addison-Wesley Professional, Microsoft Press, Sams, Que, Peachpit Press, Adobe Press, Cisco Press and Wharton School Publishing.