Have you heard about the mobile web, or are you looking to build a mobile-optimized version of your website? Why would you want to do this in the first place? Well, there's a couple of reasons:

1. Millions of people are now surfing the web on their cell phones. However, screens on phones are not well optimized for regular websites. Even on the iPhone, which has the "real" internet, it can be a pain to constantly zoom in and out and scroll around.

2. Speed. Most cell phones don't have a lot of bandwidth, so if you can strip out as much of your site as possible, such as the excess javascript, css, and large images, you'll be delivering a your content more quickly to your users.