There is a more efficient way to do content type IDS than we have done in the past: http://msdn2.microsoft.com/en-us/library/aa543822.aspx
Say we wanted to inherit from “Page”, our content type used to look something this (I’ve split up the lines so it will display properly):
0×010100C568DB52D9D0A14D9B2FDCC96666E9F2007948130EC3DB064584E219954237AF3900
188024C0FF7F45CFB85EBB43980DACF5
Meaning, inherit from “Page” (the red part), include a delimiter (00), and then [...]