There is PPGA370 which is the old Celeron Socket370.
There is FC-PGA370 which is your "FlipChip" for CeleronIIs and P3s, any new board supports both, but the pinouts are different.
But the term flip chip just means the CPU die is turned over. SocketA CPUs are a "FlipChip" design, and as far as I can tell the Penitum4 is a FlipChip design to.