Now over 1.5 million public domain books in the US (and over half a million outside the US)
will be available on iPhone and Android devices.

One needs to go to books.google.com/m in the mobile browser.

One can search for a title, author, or subject.

One also has the option of browsing the list of "Featured books" and various categories like business and economics, travel,etc.

Internet on Mobile offers a good opportunity for the search engine marketer as they can target the mobile devices for increasing the sales of their book or featuring their products however and at the same time it also poses challenges for
 the webmasters as not all the website on the internet are made, keeping the mobile devices in mind.

For example most of the present day websites are made with HTML launguage which is not a very strict launguage
however for the mobile devices website made up of XHTML strict launguage would be more appropiate.

Growth of Mobile internet provides a good opportunity for search engine marketer and at the same time
Webmaster needs to look into their website for web standatd compliance.