This is a pretty nice rundown on the bill’s specs.
From the link:
The Worker, Homeownership, and Business Assistance Act of 2009 (H.R. 3548) was signed into law by President Obama on November 6, 2009. The bill began as a simple extension of unemployment insurance benefits but then several tax provisions were added to it, namely the expansion and extension of both the home buyer tax credit and the net operating loss (NOL) carryback rules.