Am I going insane? Leapsecond?

Dec 31 23:59:59 howww-a kernel: Clock: inserting leap second 23:59:60 UTC But but but, the last leap second was Jun 30! Does anyone else see this? This has appeared on the 2/2 of RHEL5 machines I've checked so far. Google is being as dickish as google has been for the past couple of years and returns results not relevant to my search at all. -- Tim Connors