GoDaddy's case for .mobi - just for fun:

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With more and more people using mobile phones and PDAs to access the Internet, now's the time to get a .MOBI domain name. Through the end of the month, $9.99/yr* gets you a .MOBI domain and gives your visitors a quick, intuitive way to find you – even when they're miles away from their computers!

Give mobile visitors a better browsing experience. .MOBI is designed to make more of the Web viewable on tiny mobile screens.

Protect your brand from cyber-squatters. Avoid future licensing issues by registering your .MOBI before someone else does.
Put yourself in some very smart company. Visa®, Rolex®, Disney®, Google®, Yahoo!®, Virgin®, BBC® and CNN® all have registered .MOBI domain names.

Whether you're planning to start a new site or registering a .MOBI as a supplement to an existing one, now's your chance to do it for special low, low pricing – just $9.99/yr*!

But as with all other top level domains, general registration of .MOBI domain names is handled on a first-come, first-served basis, and this special price ends at the end of the month!