I know a lot of study has gone into figuring out exactly what temperature your light needs to be for bias lighting and one day, I'll get one, but for now, here's what I did.

I bought a 21" strip flourescent fixture (an undercabinet type with a switch on the fixture) that you can plug in and I mounted to the back of my big screen and it shines on the wall. Go to your local hardware store and you should be able to find one for $20 or less. All I have to do to turn it on is reach over the top of the TV and flip the switch.

I think it makes a big difference in reducing eye strain. I believe you can even buy filters that you can cut to size that you can put inside the lens of the lamp fixture that adjusts the color, but I haven't done it.

Thanks for the links SSL!