It doesn't sound like most of the states have passed laws concerning this. You don't know exactly what to believe but this article seems pretty concise. So far.
You or any internet consumer should not have to worry about this, it is the licensed seller/resellers job too! Sending a tax statement at the end of the year because they wanted to offer something the cheapest to attract your business does not cut it.
Good thing it does not apply to person to person sales here!
