How do I dampen my listening environment?

They also have foam mattress covers($10 ballpark) you could cut and use to experiment with.♫

Here are a couple other web sites with good products:
ATS Acoustics
Auralex
I am using products from both. The panel I received from ATS seemed well made and arrived very quickly. You could also go the DIY route but I think it's hard to beat the prices of these products even with DIY. Good luck.

Yeah that Auralex is OK,lot cheaper than Sonex.If your handy,get some 704-5 Owens Corning and frame and cover it.......good luck,Bob

Yes, your wood floors may indeed look gorgeous, but what you need now is a gorgeous area rug to accent the room and floor and minimize some of those reflections. Also, lots of oversized Pottery Barn floor-to-ceiling velvet draperies will help immensely.

Then along the floor borders stack a few oversized accent pillows randomly. Finally, add some soft lighting around the perimeter of the room to further highlight the wood flooring still exposed.

This should be a good compromise between aesthetics and room acoustics plus it gives you an opportunity to show off your design talents while still highlighting your cool refinished floor.

-IMO

Here's the mirror method of determining first reflection points. You'll need a friend.

1. Since in the listening seat while a friend runs a mirror along one side wall. The point at which you see the reflection of the speaker from the same channel as the well you're examining is the first reflection point for sound from that speaker and is the location at which you should place a diffuser.

2.Continue along the same wall. At some point you'll see the reflection of the OPPOSITE speaker. This is the first reflection point for sound from the OPPOSITE speaker. You should place a diffuser here as well although this is nowhere near as import as the first case.

3. The same process can be used for both the ceiling and floor.

4. Remember, while these are called "points" of first reflection, an area of usually 2'-4' wide will most likely need to be treated.

5. Skylines from RPG or Auralex panels are particular good for the ceiling. The floor, if not carpeted, can be dealt with with a rug.

Good luck