I may be one of the few programmers who studied Category Theory long before Haskell :-) (not that we've gotten to any Category Theory in the MOOC yet).
The instructor is the legendary Erik Meijer who I've decided is the Yang to Guido's Yin amongst Dutch programming language designers :-)
I've read through a few Haskell tutorials before but when I heard Brian Rosner was going to do the Introduction to Functional Programming MOOC on edX (which covers Haskell), I thought I'd join him—the first time I've had a study buddy for a MOOC.