“ It used to be that us mobile folks like myself had to convince someone with a website to build a mobile version in the hope that they could then tempt some traffic their way. However, it’s a much easier discussion to have when the publisher is ALREADY seeing significant mobile traffic, and they just need to make the decision about how to serve it better. ”
The increasingly quotable Mike Rowehl in Thank You Twitter and Facebook, about how we've finally passed some tipping points in corporate mindshare; the chicken & egg proposition is over, and seeing traffic come from mobile (via, especially, twitter and facebook) makes them want to optimize mobile sites and build mobile apps.

And if that's impressive, check out how much more information voice over mobile ("Cell phones") carries.
And don't forget people just talking to each other.