well they don't use socket 478 at all. they use socket 479 which while actually is only 478 pins is a different socket. there are also two variants of socket 479, that used for the Pentium M Banias and Dothan Cores and that used for the Yonah Core Solo and Duo and soon to be Merom.
Centrino is a mythical processor!!!!
the "Centrino" processor is just one of Intel's mobile processors bundled with their wireless technology. the Celeron M uses the original variant of s479, the same as the Pentium M.