Well it happened, the 1992 supreme court decision in Quill was over turned today. You no longer have to have nexus (physical presence) in a state to be required to collect that state sales tax on sales you make online.
I think it will take a year or so for states to get on the band wagon, but as it stands right now you have the responsibility to obtain a sales tax permit for each and every state your customer resides in. And of course file sales tax reports, including no sales tax due reports, and remit sales tax collected to each state per their schedule. Oh by the way, there are over 12,000 tax jurisdictions in the US.
However, Amazon is now collecting and remitting sales tax for Washington and Pennsylvania. Sounds good right, ahh not in WA anyway. WA requires that you track amazon sales and sales tax collected and report it, then you take a credit for the amount Amazon is supposed to remit, and pay your sales tax. If you use quickbooks, this can be done in desktop (PITA by the way) but it can not be done in QBO.