Just curious... what do you have to have to do the window/door/insullation credit? Not sure if just the receipts are ok or if you needed any special paperwork. And for how long would you have to keep the receipts? I have never filed any special kind of tax credit before and this is my first time using turbo tax so I am a bit confused.
For some reason my tax program gives absolutely no information about what qualifies, so I had to research through the IRS website.
Initially it was all energy star windows, but apparently they decided they didn't have enough money for that so any windows/doors purchased after June 1st must have a U-factor and SHGC of 0.30 or less (which basically eliminates almost all). So if you purchased them before June 1st, they just need to be energy star... after June 1st they probably don't qualify. We purchased our windows after June 1st and they are 0.32.

If you have something that does qualify, you need to keep your receipt and you need a statement from the manufacturer that the item(s) qualifies for the credit (you can download this from their website). You do not have to submit this info with your taxes, but you have to keep it on file just in case. It's also just the cost of the materials; it does not include installation.
Here's a link to the energy star website for more details...
http://www.energystar.gov/index.cfm?c=tax_credits.tx_index