What haskell topics need to be addressed in a Real-World-Haskell style?

Here’s my take, biased towards the ecosystem.

Libraries

• arrays and array programming:
  • vector
  • repa
  • hmatrix
• numerics
  • random numbers
• parallel programming
  • The Par monad
• unicode and locales
  • text and text-icu
• parsing
  • attoparsec
  • tagsoup
• networking
  • snap and/or yesod
• web stuff
  • templating
• persistance
  • databases beyond hdbc
  • no-sql storage bindings
• graphics
  • cairo
  • sdl
  • opengl
• xml
  • haxml
• crypto
• processors and systems stuff

Techniques

• generics
  • uniplate
  • syb
• metaprogramming
  • Template Haskell
• data structures
  • designing data structures
• EDSLs
  • designing EDSLs
• memoization
• designing with monads

Tools

• ThreadScope
• Advanced FFI tools
  • c2hs
  • using Haskell from C
• Tuning the runtime, esp. GC flags