Should the internet be taxed?

I live in Illinois and previously had never been charged tax on any kind of internet purchase. This weekend I attempted to make a purchase and it charged a tax. What I'm wondering is if something changed recently to affect this? It was multiple websites...

I live in Georgia and I was thinking about playing some internet poker on Fulltilt.com. I was wondering if I won money off of the site will Georgia tax that income? -How will they keep track of your winnings? -Are you evading taxes if you just deposit...

and can non immigrants, who come to canada to study, start their own company without have to be residents, if their company does very good income on the internet?

I was inquiring about opening a website with the intention of generating revenue from advertising. Its unclear whether I would have to remember how much tax I owe, or if it is automatically deducted before I receive revenues. Is there a source explaining...