This could be significant. The individual mandate is one of the worse things about the bill, even though it hasn’t gotten the attention of the public option:

Mr. Obama and most Democrats support a proposal that would require most Americans to carry health insurance. Under Mr. Baucus’s proposal, a family that went without coverage would be subject to a penalty of up to $3,800 a year.
The committee documents show that Mr. Grassley has reservations about this approach. He believes that “the individual responsibility to have health coverage should be reconsidered and replaced with a reinsurance policy to ensure that affordable health coverage is available to everyone in a voluntary system, with a lower overall cost for the package,” one document says.
Under a reinsurance program, people carry private insurance, but the government might pick up some or all of the cost of claims exceeding a certain amount.