The GHC Runtime System [pdf]
scs.stanford.edu
scs.stanford.edu
I did not take notes, but another student takes very extensive notes for the class and posts them online. All his notes for the class can be viewed here (scroll all the way to the bottom):
Unfortunately there don't seem to be any accompanying notes/etc.
http://ezyang.com/jfp-ghc-rts-draft.pdf
It's just a draft but it's pretty great.