You can also trade BTC vs L$ at
The Rock Trading.
I actually do 90% of my bitcoin trading there, they have some BTC (and L$) investment funds as well.
The Rock HQ is in Buttermere region in SecondLife.
I just looked through the website and I was excited because the L$/BTC exchange rate and fees were better than Virwox but the site is very poorly constructed. I deposited L$ which never showed up to my account, I tried to withdraw them and I was not allowed to. For a virtual "stock market" their listed liquidity is only about 12k USD and their BTC volume is very low. It feels very scammy to me since I know the history of the Bank run in SL they claim to have insured and, well, they took my money and they haven't given it back yet.
It's that or it's really a hobby website trying to pose as more than it is.
I appreciate the link though, I like to know what exchanges are out there

. I'll let you know if they give me my money back.