From another point of view: what if you're not Amazon and doing online retail in California? Amazon now has a one-year price advantage. Is it enough to disrupt market share in that state?
Amazon is not currently collecting sales tax in California, so there's no change until Sept. 2012, when it will start collecting sales tax in CA (assuming this goes through.) It's business as usual until then.
Everyone selling things online in California is supposed to be collecting sales tax as of July 1st. This delay until September 2012 applies only to Amazon.
Everyone else selling online in CA with similar areas (Zappos, Barnes and Noble, etc) still needs to pay the tax this year.
