If you purchased a plug-in electric automobile in 2009 or converted a non-plug-in vehicle to a plug-in vehicle after 2/17/09, you may be eligible for a credit on your 2009 taxes.

If you made contributions to an IRA, 401(k), government Thrift Savings Plan or other retirement funds, you may be eligible for a tax credit if your Adjusted Gross Income on your tax return is less than $27,750, $55,000 if married or $41,625 if you qualify as Head of Household.

If you made improvements that made your primary home much more energy efficient, you may be eligible for a 30% credit up to a total of $1,500.  Some of the qualifying improvements are:  new insulation, replacing exterior doors and windows, putting in a sky light, metal or qualifying asphalt roof, heat pumps, air conditioner, water [...]

If you were issued a Mortgage Credit Certificate on a new 2009 mortgage on your primary residence, you may be eligible for an additional tax credit.

First time home buyers can receive up to an $8,000 tax credit for homes bought after 2008.  You can also claim the credit for a home you purchase before May 1, 2010 on your 2009 return. 
Long-term home owners may be eligible for a credit of up to $6,500, if you purchase a new residence between [...]

The Hope Education credit has been increased to $2,500.

There are now two energy credits available for your home.  Each can be worth up to $1,500.  The ‘Nonbusiness Energy Credit’ applies to energy improvements you make to your home for certain high-efficiency heating and air systems, water heaters and stoves.  The credit is for 30% of the cost and will apply to purchases made [...]

You may be eligible for a $250 credit ($500 if married filing jointly) if you received retirement benefits from a U.S. or state or local government agency and the service was not covered by social security.  You are not eligible for this credit if you received the Economic Recovery Payment through your Social Security, Railroad [...]

You may be eligible for a $400 credit ($800 if married filing jointly) if you had earned income as an employee.  Your credit will be reduced if your Adjusted Gross Income is over $75,000 ($150,000 if married filing jointly) or if you take the government retiree credit or if you received the $250 Economic [...]