Let the hive mind of Engadget get that for you.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
It looks to me not so much like a filter, but a bizarre yellow/pink bright light shining right on their faces. It's truly odd, though, and I've never seen lighting like it before on television. They don't seem to be making any attempt to hide it, either, since the shadow frequently falls across Diane's chest -- seriously, a dark shadow that clearly shows the yelllow/pink light ending. It's up lighting, too -- when they put their hands or their pen or whatever in front of their faces, they get a dark shadow that shows the light is right in front of them and pointing upwards. I now watch the show just to see the weird lighting!!