[Haskell-cafe] Idiomatic error handling in Haskell

[Rouan van Dalen]

There are quite a few exception handling mechanisms provided by Haskell,
as can be seen from this post: 
http://www.randomhacks.net/articles/2007/03/10/haskell-8-ways-to-report-errors

I would like to know what is the preferred Haskell mechanism for handling 
exceptions in
the IO monad?  I am not concerned with mechanisms such as Maybe / Either, but 
would like
to know about exception mechanisms inside the IO monad.

The 2 I know of are:
  o) throwDyn 
  o) ioError and catch

I do need the exceptions to be extendable.  So which is the preferred way
to handle exceptions in Haskell for new libs?