.mobi websites take into account the much smaller screen size of your mobile phone, the fact that you're out and about and don't have time to sift through a lot of information, and how expensive it is to use the internet on your phone.
That's why .mobi sites are leaner, faster, and more to the point so you can get the information you need when you need it, quicker, with less scrolling and clicks, allowing you to be more productive on the go while saving you time and money.
When your phone gets stuck in traffic behind some truck-sized .com site, do you sit there revving up your phone bill or do you switch over to the .mobi express lane and surf away faster and cheaper? It's a no-brainer.
What's even better is that .mobi sites can also be viewed on PC's as well, so you get the best of both worlds.