The Green Bay Packers just announced it on their website. From Packers.com:

The Green Bay Packers have released LB Nick Barnett, LB Brandon Chillar, DE Justin Harrell, LB Brady Poppinga and T Mark Tauscher. The team also waived first-year S Michael Greco and first-year LB Curtis Young. The transactions were announced Friday by Executive Vice President, General Manager and Director of Football Operations Ted Thompson.

If you aren't very familiar with either Greco or Young, you're not alone. They both spent part of the year on the practice squad, but they both did travel with them to Dallas for the Super Bowl. 

I'm surprised they couldn't trade Barnett for a low draft pick, but knowing the Packers were going to release him if they couldn't trade him certainly depressed his value. He may sign quickly somewhere, and the Lions are already in pursuit.

I'm not sure what the future holds for Chillar, Harrell, or Tauscher. I'm still surprised they released Poppinga, they had kept him around for so many years I don't know why they wouldn't keep him again. All four players ended the 2010 season on I.R., and while some are more injury prone than others, their immediate future will depend on how healthy they are.