The infographic created by Credit Season is one of the most wide-ranging we saw about the economical impacts of the London 2012 Games. Lots of stats there, including the ones related to the number of additional jobs in the next 3 years, due to the Olympics.
From the site:
Evidence from previous Olympic games suggest that there are substantial immediate benefits for the host cities at many level, mainly in infrastructure; however, it seems that there is no guarantee that the event will generate a profit for the host, and in some cases the long-term effect in the economy can be not only negligible, but even detrimental.
Read the full article and access the infographic here.