Alot of those grounds are extras. I think the VCC is power. There is a + and - signal header for each port. as well. So for each port you should have something like this:
VCC x
Ground
UPx-
UPx+
you might want to look
here , its the manual for the Antec Sonata that llists how the front usb ports are hooked up. It might clarify some things for you.