Down 7.4% so far today (2 PM on 7/7/08) with an annual dividend yield of 14.3%. This at a time when a bank CD pays 4% or less!!! With a 14.3% yield, even a drop in NAV probably wouldn't justify this type of drop.
I don't know why the price is dropping. It could be that some hedge funds or some big investors are playing games with the stock and that they may have set off a bit of panic selling.
If I had the money to invest, I'd add to my position right now.