Google has released a list of the most searched keywords in 2007 (global) and the keyword iphone is on the number 1 spot.
It's google zeitgeist who have ranked the fastest rising words. Iphone beat both badoo (nr 2) and facebook (nr 3).
I think it's pretty interesting because the iphone were first only released in the US, still it's on the number 1 spot across the globe.
I don't know if it has been released anywere else?, but when it does it just going to get bigger.
Also, google zeitgeist is a pretty cool service. You can see how different keywords compete. For instance you can checkout who's the most popular president candidate.
Check out zeitgeist here