We have two problems:
One, we're a lot poorer than we thought we were two years ago. Only years of hard, smart work are going to get us out of that problem. The most obvious ways government can help are too get off the backs of productive enterprises -- lift anti-discrimination regulations, the more extreme environmental regulations, and the like.
The other problem is something the government might possibly be able to help with. And that is that it's currently prudent to assume there is a high probability that any financial institution you might want to deal with could be broke because their books are black boxes, especially the mortgage-backed securities they own. So, you don't want to invest in them or lend them money because you don't understand their financial position. This uncertainty over the value of financial instruments linked to mortgages can make things even worse than they really are -- All we have to fear is fear itself, etc.
So, it's time for the government to open up the black boxes by requiring all parties to mortgages, mortgage-backed securities, and derivatives tied to mortgage-backed securities to post everything on line. Privacy be damned.
Then, let Wikipedia or something else like that start accumulating information pertaining to the value of each mortgaged property in America: connect to Google Maps street shots, Zillow price estimates, how much comparable homes in the neighborhood are renting for, Census data on local demographics, you name it. This info on each mortgage could then be linked to the mortgage-backed securities that hold slices of that mortgage. From that, informed market prices for mortgage-backed securities (and related derivatives) could emerge.
This process of wide-open public price discovery would no doubt lead to some pretty appalling discoveries about what prices for these financial assets ought to be, but so be it. It's better than not knowing how much gigantic assets are worth.