Why would anyone buy Yellow Pages application for iPhone?!?

[TLB]

I have an online version of the local white & yellow pages on my computer. It is basically a digital version of the paper book with all the ads and even coupons. It has a great search engine (fast and accurate) and a nice browse capability, if I don't exactly who or what I'm looking for. For local stuff it is a lot better than Google and quick--I use it first. Don't have an iTunes account or an iPhone, so I don't know how his app compares.