I remember when it was a currency. Now, it is just something which is only viable for selling to the next guy in town; he is hoping he won't be the one buying before it pops and you selling hoping you won't be the one regretting it in a week. Unless it stabilizes and is not hoarded for the sake of selling at a higher value, Bitcoin will be a bubble. Its value is changing too rapidly to properly use it as a currency.
See this log chart. http://bitcoincharts.com/charts/mtgoxUSD#tgSzm1g10zm2g25zvzl
Right now it is rising, but soon enough it will stabilize for some time.
Happens every year, once or twice.
If you do some research, you will see that it is being used more than ever for purchases. You may think otherwise because of the media hype/bubble time that is happening now.