Amazon

In April, New York changed its sales tax law to try to make a few large vendors subject to sales tax collection - most notably, Amazon.com.  The new law creates a rebuttable presumption that a vendor is soliciting business and thus required to collect tax if, per an agreement, they compensate New York residents for directly or indirectly referring potential customers. Referrals may be made through a website or other means. The presumption only applies to sellers with over $10,000 of sales to New York customers made via the referrals in the prior four quarters. Sellers may rebut the presumption by showing that the residents did not solicit sales in New York for them. (Bill Summary, p. 10)

Amazon's "Associates Program" causes it to have many associates who may be New York residents. Amazon filed a lawsuit as soon as the law went into effect challenging the new law as unconstitutional. It also started collecting the tax!

Another company that fell under the law change is Overstock.com. Their remedy was to cancel its agreements with its New York affiliates who were helping Overstock.com advertise.