Currently only within California is sales tax charged because I don't have a physical presence in other states (Nexus).

That is the current law, unless Congress changes it.

There is another online bill headed for congress.
http://www.internetretailer.com/2011/04/14/another-taxing-situation-e-commerce

My personal opinion is online commerce should be taxed, but it needs to be made simple for retailers.  The current mess of various sales taxes charged around the US is super complicated.

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