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And what about people who program in C, C++, perl, python, erlang? How is that useful to them?

The Haskell folks actually recommend you use Emacs for all your editing needs. The Emacs Haskell mode is supposed to be awesome (I've never used it, since I use Vim).

Extending Emacs or Vim to work seamlessly with your programming language is, IMO, a much smarter move than building an IDE from scratch.

Leksah is the Haskell IDE

http://leksah.org/

> ... runs on any platform where GTK+, gtk2hs and GHC can be installed ...

That's the problem. GTK doesn't work very well on the Mac, and (AFAIK) there's no GTK+ on Haiku. OTOH, Emacs works perfectly on both platforms :)

Or a new programming language that we haven't even heard of. Emacs (and Vi(m)) will typically have a programming editing mode long before v 1.0 of the lang comes out (c.f. clojure-mode)

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