The next stage of the national housing crisis is well underway, especially in communities that have been in the center of the implosion of the subprime housing market. From California to New York, there are houses for sale for pennies on the dollar, and in a scattering of hard-hit neighborhoods some houses are going for a few thousand dollars each. These houses present intriguing opportunities to buyers willing to put some care into their rehabilitation. In many cases, they sell quickly. Here's a sample of what we found still on the market or recently sold.