Personally, I'm not too thrilled about having to pay more for my online purchases, but I understand that states must collect their fair share of taxes.
As for whether this has changed what I'm shopping for online, I'd say not really. I still buy the same things I always have, but I might be a bit more mindful about where I shop and how much I spend. By the way, have you heard of paystub generators? They're really helpful tools for creating paystubs and other financial documents on the fly. I've used one before and it saved me a ton of time and hassle.
 

Not so much on Amazon as the free 2-day shipping is still a great benefit, but on eBay I'm thinking about purchases more; especially on those items that are selling for a premium to begin with. I do find it odd on there that I have to pay tax on an item that someone already paid tax on. Ebay also has to adjust their system so that I'm not getting charged twice; once for the item and again for the tax.