The way I understand this from Skatteverket Sweden:
https://www.skatteverket.se/privat/skatter/vardepapper/andratillgangar/virtuellavalutor.4.15532c7b1442f256bae11b60.html?q=bitcoins

Is that no matter what it is you trade, if you make a profit you pay tax on the profit. As simple as that. If you buy bitcoins, poems or dogshit for FIAT currency like SEK (Swedish Kronor) at a lower price and then sell for SEK at a higher price you are considered to have made a profit.

I have just started to learn about bitcoins and ofcourse every one wants to make taxfree money, but is it really what it is all about? To avoid paying taxes or is it something else? I don't really know. Do I want to enjoy "free" healthcare and other social benefits without paying taxes? The wonderful thing about bitcoins is that it forces us to question the whole financial system. Who knows where this will take us. One thing is for sure.... I think we're in for a bumpy ride for the years to come.