Click on the link above to view the NAR's chart.
NAR (The National Asso. of Realtors) published this helpful chart comparing the last tax credit available to new homeowners only to the new one which extends the tax credit to individuals who currently own their home for 5 years or more.
The New Tax Credit has been signed into law by President O'Bama. This chart provides a solid framework for the mechanics of how the new credits will be applied.
For even more detailed information check out this government website: