There's a number of factors at work (and no, it isn't just handguns- rifles and ammo are also involved, even though it seems the shotgun world has gotten off lightly).
1) Obama panic. This seems to have been in three waves, the first after the election, the second with the inauguration, the third when Holder started mouthing off. This was the overriding driving force behind all of this, but by now if people were fearing immediate bans, they've already bought their guns (probably overpaying). Since it appears that a new AWB is far from a priority for the While House and/or Congress, this is dying down.
2) Money. We are still in a recession. There's only so much money out there looking for product. The glut of dollars entering the market over the past seven months was finite, and when combined with #1, I think many of those who were more panicky have run out of cash. Those Bushmasters being sold for $1600 weren't the investment the buyers thought.
3) Satisfied market. When people have what they want, they quit looking. Even if folks don't trust Obama and still have money, at some point they'll have what they want (at least in the near term). Even if you aren't broke yet, there's a limit to the number of new guns you can really play with. Supply has finally began to satisfy demand, and we're going to rapidly be back to pre-panic supply levels in many areas of the firearm market.