Paul Holden, lead architect for the game, was recently quoted at the Montreal Game Summit as saying:
“The figures are obviously changing daily. The last figures I saw there were over 1.3 million levels.”
So at this rate, there will be 2 million levels at around July of 2010. That is a massive amount of community content and would likely take multiple lifetimes to play through every single creation out there. How soon before the PSP version of the game hits 1 million created levels?