Despite all the buzz and hype it has generated, cloud computing represents just 2 percent of the revenue in the IT infrastructure market, according to Tier 1 Research. But not for long, as cloud computing is the fastest-growing business model in the sector, and will grow to more than $1 billion a year in revenue by next year. “Slowly but surely, that 2 percent will become a bigger piece of the pie,” said Antonio Piraino, the Research Director of Tier 1, in his keynote message at Wednesday’s Datacenter Transformation Summit in Reston, Va. Internet infrastructure is currently a $35 billion market, according to Tier 1, with Infrastructure as a Service (IaaS) cloud computing revenue expected to reach $735 million for 2010. But that cloud market share is expected to grow to $1.25 billion nest year, $2 billion in 2012 and $3 billion in 2013.