Just a few things that might be interesting to notice.
If we check the average trend over a long period, Bitcoin is on an upward trend. I believe Bitcoins are worth more than the shown average trend, but the current price has very recently skyrocketed for no apparent reason. There has been very little asks depth these last few weeks.
Some have pointed out more transactions, more adoption, as a main factor:
http://blockchain.info/charts/n-transactionsBut I'd like to point out SatoshiDice is becoming more and more popular and now represents the majority of transactions, and money is mostly moving back and forth between SD and the user, in very small amounts per transactions. Even so, the actual output transacted has declined steeply and the estimated transacted volume has been quite stable, although on the rise slightly:
http://blockchain.info/charts/output-volumehttp://blockchain.info/charts/estimated-transaction-volumeAnother sign that adoption is slow, albeit steadily going upward.
There seems to be an incredibly high amount of:
"Bitcoins can only go up"
"We'll all be filthy rich"
"You can always sell it for more to someone else"
The price is up quite a lot without any real massive growth for the economy/services providers backing the Bitcoin economy with useful purchase opportunities.
As far as long-term I think Bitcoins will rise in price, right now I have yet to see any good justification to the current Bitcoin price other than people witholding selling BTC because the price keeps rising and buying more BTC speculatively.
"Bitcoin can only go up, there's massive adoption!"
The only massive adoption I see is Bitcoins getting sold more and more as everyone sees the price going up. Not for services nor anything. Just to make a profit.
Bubble pretty much?
(I remain long on Bitcoins for long-term (span of a few years). Short term? Bearish. I don't that price is CURRENTLY sustainable.)