I’m going to start with some large numbers. The current global population is around 6.7 billion, smartphone usage in 2010 was calculated at 526 million. This works out at around 8% of the worlds population are using smartphones all with potential access to the mobile web.

Source: http://www.cisco.com/en/US/solutions/collateral/ns341/ns525/ns537/ns705/ns827/white_paper_c11-520862.html
In 2010 Google was serving up to 200 million YouTube videos a day to mobile devices. Traffic on the AT&T (US) network has grown 3000% between 2009 and 2010 (yes 3000%) with similar trends throughout Europe’s networks. The figures are astonishing but what isn’t, is the slow uptake of the mobile web market by businesses.

Source: http://ie6countdown.com/
Internet Explorer 6 currently has a market share of 3.3% in the UK whilst iOS is responsible for 5.5% of the UK’s web traffic that isn’t even taking into account Android, Blackberry and Windows Mobile. More resources are pumped into making things work for the 3.3% of users using a 10 year old browser than the 8% of people using smartphones. If you look at the behavior of the different user groups of IE6 users and smartphone users, which are most likely to use the internet as a primary source of information and purchase?
As a business this market has huge potential, especially with the growth seen over the past 3 years. Providing a dedicated mobile experience greatly increases the user experience and potential for users and this can only aid in sales and interest.
To finish on, Amazon announced last year that it topped $1 billion in sales from users on mobile devices with it’s mobile site playing a huge part in this. More businesses need to follow in Amazons footsteps and embrace the mobile market.