SecondMarket's Bitcoin Investment Trust (SMBIT) has enabled liquidation of its shares, "on a limited basis", it seems: https://bitcointalk.org/index.php?topic=337486.msg3620842#msg3620842
Presumably only the earliest investors (who entered in September 2013) are being allowed to liquidate. They bought shares (fixed at 0.1 BTC each) at ~13$, are liquidating now at ~45$. That is ~245% return over investment in 6 months, or ~1100% per year.
On the other hand, all investors who entered after November 15 currently have lost money. Many of them lost more than ~40%, or ~64% per year.