This is what you need to know: sounds like the White Sox are resigned to losing Buehrle, he's seeing 3-year offers, and there's a slew of teams interested:
Sources: Yankees, Red Sox, Cubs pursuing Buehrle - JonPaulMorosi
"As recently as spring training, Mark Buehrle spoke publicly about the possibility of retirement after the 2011 season. That’s not going to happen. In fact, it’s possible that the free-agent left-hander will sign a contract that rivals the four-year, $56 million deal he signed in 2007."
Nationals kicking tires on Mark Buehrle - The Washington Post
"The Nationals want to add a veteran starter to their deep, young rotation, and all three starters – widely regarded as the three best starting pitchers currently available on the free agent market – fit that bill. It is believed that their top priority is Buehrle, but that could change based on the price for each pitcher develops."
Miami Marlins Still Talking With Mark Buehrle - Palm Beach Post
"Beinfest and general manager Mike Hill spent part of Tuesday meeting with the agent for starting pitcher Mark Buehrle, who is said to be warming to the idea of playing for the Marlins in 2012."
White Sox GM Ken Williams not optimistic about Mark Buehrle’s return - Chicago Sun-Times
"According to major-league sources, Buehrle is receiving three-year offers from other teams while the Sox have offered a two-year deal."
Your Morning Phil: Buehrle, Danks, Verlander - chicagotribune.com
"Like many of the White Sox’s fans, Williams seems to have been waiting for Buehrle to reach the end of his run as one of the organization’s most successful pitchers ever. And you can understand why he didn’t get a running start on this contract negotiation. As far back as the spring of 2009, Buehrle was talking about an early retirement, not looking for his next contract."