Here's one I haven't seen yet. The numeric DNIS (Dialed Number Representation System) version of popular .com domains are being registered for cell phone users. Someone who attended the Facebook developers camp with me yesterday registered Facebook.com (32232665).
Alternatively, the same result can be achieved by entering the numeric-domain equivalent of the word 'facebook'. That sequence looks like this: http://32232665.com, which needs only 8 input clicks, almost 3 times fewer clicks.
As the owner of the 32232665.com numeric-domain, I was looking for some advice from those in the know as how to best incorporate the numeric-domain into the mix to make it easier for Facebookers to access the mobile version of the site. I proffered the use of the domain and am awaiting a response from their mobile team.
In the meantime, feel free to use 32232665.com.