A good example is Google's newly updated Mobile App for Apple's iPhone, which has been generating a lot of buzz for one main reason: voice search.

Want to find the nearest pizza place, showtimes for the James Bond movie "Quantum of Solace," or the latest Bruce Springsteen video? Google voice search is uncannily accurate.

But it has obvious limitations, particularly with names. Say "Barack Obama" and you get a full page of data. Try "Emile Zatopek," the famed Czech distance runner? Forget about it.

Of course, there are many applications available for download on all sorts of mobile phones, but touchscreen devices have emerged as consumer favorites.

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