Dave (xcslowpoke) emailed me this advice, which I thought any mtb'r could use.
RR is a different beast.
You have be very aware of pack position and intensity changes. I've watched alot of my friends try and switch between MTB and RR and its quite funny to be in a RR with them. Most MTBers are all about putting max controllabe effort in at all times where RR is about maintaining to the pack changes. One thing that I see on your list of needs is to learn to monitor the efforts of others around you. Understanding who has alot left in the tank vs someone who is struggling to stay on will determine what wheel you want to sit on.
RR has a lot more thinking envolved. They are very different but that what makes me like both.
I need to stay on the right wheel!