2010 Chicago Marathon registration is closed

It seems this weekend's Shamrock Shuffle, despite the frigid temps, motivated on-the-fence runners to sign up for the Bank of America Chicago Marathon. Registration has reached capacity! It's a new record, according to the marathon office: "45,000 participants have signed up in record time to complete the 26.2-mile race. The capacity was met in 51 days, closing a full month ahead of 2009s record pace." Crushed by the news? Would-be marathoners can still snag an entry through participating charities.