See StateMonad.hs, Thursday-interaction.txt, and Typeclasses.hs
Also have a look into the XenClient repository network.git. We had a brief look at it's network slave daemon today.
Most of what happened today is in Tail.hs and Wednesday-interaction.txt
Please have a look in Wc.hs, it's most of what we talked about on Tuesday.
There's some auxillary code in Points.hs, Sqrt.hs, and Stuff.hs.
Unfortunately, I didn't keep the interaction with ghci today.