Try to type in http://www.iphone.com although they sell mobile phones, you don't see an iPhone at this site, as this site is not owned by apple, and has probably been registered by some speculate thinking "hey, if people wants to buy a phone they will at this point type in iphone.com".
And yes my guess is this guy is getting a lot of traffic by people just just typing in the address in the address bar.
But this guy it not the only one, according to Name Intelligence, about 450 domains with the word "iPhone" were registered on Jan. 11 and about 375 on Jan. 12 - just days after Apple Chief Executive Steve Jobs unveiled the iPhone at the Macworld conference in San Francisco.
Several of these domain names can be found and bought at a very high price on auction sites like ebay.