Who here really thinks that 2006 materials are too outdated for 2007? I know they change the LOS a little, but I would think you could figure out the difference and independantly research any new material. Just because they change 30% of the readings, doesn't mean any concepts have changed.
To specifically answer the question asked. I would be more concerned about the fact that you have only study notes and not the CFAI books. So, ultimately I don't think your materials are outdated, but if you absolutely must buy something new, I would opt for the CFAI books to use with your 2006 Schweser notes.