centrino is a type of motherboard that supports wireless, or has an integrated wireless card.
turion vs. pentium m...
i guess it depends on what you like more, and what theyre priced at.
turion is 64-bit, pentium m isn't.
pentium m probably performs a tiny bit better if theyre at the same frequency... but i think it has more cache as well.
i'd personally go for whatever is cheaper.