The content is also freely available online already and is well worth a look if, like me, you are keen to learn more about developing actual useful programs with Haskell.
I first mentioned Real World Haskell last year. At the time I also highlighted GHC’s LGPL problems as an obstacle that could potentially discourage the wider adoption of Haskell. It seems that some progress is being made on that front. At present though, GHC will still statically link to GMP, which means that developers who distribute GHC-compiled binaries are distributing “derivative works” as defined by the LGPL.