I recently went into the attic and noticed a few areas of low insulation, so I was hoping to purchase some additional insulation and qualify for the 10% federal tax credit for energy efficiency upgrades. Albeit late, I was disappointed to read that certain federal tax credits expired at the end of 2011, attic insulation being one of them.
Additionally, my 75 gallon natural gas water heater is about 15 years old and I'd just started thinking about replacing it with a new Energy Star rated unit, such as a tankless version. Unfortunately, the tax credit ($300!) expired a few days ago as well... Hopefully my old water heater can last through one more winter.
Anyways, it seems that the only energy efficient tax credits available for 2012 are related to renewable generation (solar, wind) or other more exotic products, like the residential fuel cell. Perhaps I'll look into the latter and post about it.
On a related note (to renewables) I'll also write about my recent experience with solar power and smart meters.