What does the CC code on W-2' forms mean?

The special "code CC" on the 2010 W-2 has to do with the HIRE Act (Hiring Incentives to Restore Employment), which was signed into law in last year.

With the HIRE Act, employers could take a payroll tax exemption of their 6.2% share of Social Security if they added a new qualified employee to their payroll during the period of March 19 - December 31, 2010.

Unfortunately, the employee doesn't get any tax breaks if this is on the W-2 :-\