Historically, since WWII each rapid spike of oil prices over 2006 100$/barrel for a few months is followed with a recession one year later. If the trend stays true, 2012 will be a recession year.
World GDP in a country with fast-growing economies and slow-growing economies, is not that useful a measure.
As an example, Brazil, China, India have actually been growing at rates that would be miraculous in the US, because they have labor-intensive industry and increasing oil supplies.
Old countries like the US, UK, France have barely moved the needle, and are scraping by through money-printing to finance massive deficits.
Yes, there was a serious recession in 2009. In 2010, world GDP increased by 3.9%, according to preliminary World Bank figures.