I own half of a Bitcoin. I purchased about two weeks ago. In the intervening time, the value of Bitcoin has gone up 40%. I can't complain, and I'll probably buy more in the near future. It is somewhat disappointing that they can't be used for anything, though. Without practical applications, Bitcoin is subject to massive volatility and doesn't have any sort of foundation to prevent against collapse of the market.
Incidentally, I also developed a Bitcoin Twitter ticker. If anyone would like to keep up with hourly prices via Twitter, I suggest that you check it out.