Can't find it anywhere online yet, but radio reports say it just came across the AP wire that BRETT FAVRE IS RETIRING as reported by Jay Glazer.
More info as soon as we have it.
Edit:
The Story is on FoxSports.com
http://msn.foxsports.com/nfl/story/7870944/Favre-has-decided-to-call-it-a-career
Edit 2
ESPN is reporting that Favre's agent, Bus Cook, has confirmed Brett's decision to retire.