There are a few different dates out there and it's highly confusing to figure out a straight answer ... But it's worth noting that the normal support policy for service packs has been extented with a grace periode of approx. 3 months, which makes the end of support date for MOSS 2007 SP1 July 13th 2010.

I guess the calculation is that the normal support has been extented until the 2nd Tuesday following the first CU after SP2 (and with all stars aligned....)