This article from Usability News has some startling news about how poor usability has affected the use of Internet services on mobile devices. The survey commissioned by Hostway found out that almost 75% of users do not use the internet capabilities of mobile devices such as PDAs or cellphones because of poor usability.

At this point, it has become more evident that usability in an emerging platform is more important than ever. It also a bit surprising that Jakob Nielsen has written about it almost five years ago in his article about mobile devices.