If context is important, searching on mobile devices should be very useful to individuals. For some reason, these services haven't taken off in the US. Simply providing applications that exist for the desktop is not the solution. Since users of mobile devices seldom share their device with others, they are ready for very customized search results. In addition, the availability of locational information can significantly improve search results. Some interesting applications are being lauched to identify potential social and entertaintment opportunities. See an interesting
article on CNET about Google and its mobile ambitions.