An extended technical report has been released at: TR & software: http://homepages.cwi.nl/~ralf/OOHaskell/ TR: http://arxiv.org/abs/cs.PL/0509027 "Haskell's overlooked object system" 10 September 2005, 79 pages by O. Kiselyov (FNMOC, Monterey, CA, USA) and R. Laemmel (Microsoft Corp., WA, USA) Some recently added topics: - Many Haskell 98 encodings - Safe value recursion - Safe downcasts - Safe co-variant method arguments - Nominal subtyping - Iso-recursive object types - With and depth subtyping The report describes and classifies all principled, to our best knowledge, object encodings in Haskell98, with and without common extensions. On the one hand, this report covers many advanced topics, as to make it interesting for programming language researchers. On the other hand, the report is detailed and lightweight enough to be useful as an OO-FP tutorial. Regards, Oleg and Ralf