I don’t own a single .mobi domain name and I have absolutely no plans to register or purchase any now or that I can see in the future (just want to avoid an avalanche of emails with domain names for sale).
With that being said, I must say that I found DomainFest.mobi to be very useful when I was at the DomainFest conference. Oversee.net set up its mobile site on DomainFest.mobi, and it allowed me to quickly access the DFG agenda and get other information from my Blackberry very quickly.
In looking around the site a bit tonight, it looks like the folks at .mobi set it up using its goMobi service. I don’t know how much it would cost for someone to build a site like this, but it’s interesting to consider.
I am not really that tech savvy, so I don’t know if conference organizers could have done the exact same thing with DomainFest.com simply by detecting my Blackberry. I believe JetBlue (among many other websites) automatically detects Blackberries and other mobile devices and provides an optimized site without having a mobile-specific url.
In any event, I thought it was a very good use of a .mobi domain name.