MDT 2010 will build your images for you, almost automatically. Don't know if that is the answer to your question, but I never had any issues building an image and I don't know sysprep from a hole in the motherboard. it has been many months since I did that stage of our testing, so maybe I am just not remembering it correctly.
EDIT: Quick google lead me to
this document (PDF) which seems to describe the basic steps I used. I am pretty sure I used technet directly though.