No, they don't light up. The Lycossa keyboard is the one that lights up, and that is the one a very good friend of mine has along with his $1,900 computer. I'm pretty sure the Arcosta is the same thing as the Lycossa, except it doesn't have the backlit keys, and it's half the price.
That's the one. I really liked it- you can also switch between the colors it lights up by simply pushing a button. It can be blue, purple, green, or red, I beilieve. It was blue one night, and when I left the room for 10 minutes and came back, I noticed it was purple and I was confused. He just hit a button and it went back to blue xD.
Wait- I'm deeply sorry- the Lycosa does light up but ONLY in the color you bought it. My friend actually owns the Anansi. It's $20 more than the Lycosa.
You can visit their site, it's razerzone.com
EDIT: It turns out the Anansi doesn't just switch between a few colors, but blends of 16 million colors! He must have set a few favorite colors and programmed them to a key or few on his keyboard. Check this out http://www.youtube.com/watch?v=Hmhaetfl3PE
Yes, that one is the Anansi. No mistakes this time. When it says 16 million colors, it means on the color wheel, so most of them look the same except you can eventually see blue, turquoise, then green, and so on. That's why it faded through all those colors in the video.
No problem =D.