There's so little selling that it is difficult to determine FMV. But it seems to me that short sales are offered pretty close to FMV, with the notation that they are a short sale, which should tip any buyer off that "best offer" is what it is going to cost. I don't look at the listing and say "gosh, what a deal"
The foreclosures, however, seem to be offered as low as 50% of FMV. You see the asking price and the photos of the property and it's almost stunning. You get this "holy cow!" reaction.
I hope that the foreclosures aren't selling that low, but even if they aren't it destroys the buyer's expectations when they see the ads (I've spoken to people who have tried to buy several and couldn't). They look at a house that's listed at FMV and all they can think is that they've seen one like it offered at $99,000 instead of the $200,000 for the normal listed one.
I think the banks are slitting their own throats, because there are people with $200,000 mortgages that see a similar house for sale for $99,000, and they decide to walk away rather than to pay $200k for a 99k house (even if 99k is not the actual final sales price)