Rob Bell is the founder of Mars Hill church in Michigan. His wildly popular church of 10,000 (composed almost entirely of card shifters) and his writings have garnered him wide attention.
He is attempting to re-envision the church. Unfortunately, most heresy is grounded in trying to add a guest wing to God's Church.
As a postmodern and Emergent Church member, Rob Bell is repaving the errors of America's theological liberalism. It is quite amusing that so many people think he is creative and pioneering. Take a peek at the Alliance of Confessing Evangelical's review at Reformation 21. I think it says it all.