I recently had the opportunity to speak at the mobile 2.0 conference in Paris. There are lots of events of that kind but this one was all the more interesting as there was a European start-up contest, showcasing how innovative mobile is.

What stroke me is that all the themes and roundtables were focusing on online trends expanding in the mobile space. From social networking to widgets via m-commerce, this is all about web ideas being reinvented in the mobile space.

Definitions of web 2.0 vary quite a lot. For mobile 2.0, this is all the more difficult as I think it is the result of a constantly evolving process: the convergence between web and mobile.
The result is yet unknown as mobile is a new and complementary channel / media with its own specific rules.
There are no doubts though that this market is evolving quickly despite the economic crisis.
Forrester recently fielded a Technographics survey in Europe: Mobile Internet penetration now stands at 24% among Europe online users on a monthly basis. Forrester will soon publish a report with detailed analysis on how the European mobile Internet space is evolving. 
You can continue to ignore mobile 2.0 but at your own risks. Not having a mobile presence nowadays is a bit like not having a web presence circa 1999 / 2000.