To install haskell-mode on Emacs
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[First install the Haskell Platform. This includes ghci, which is used by haskell-mode.]

1) Install Emacs version 24.0 or higher
2) Open Emacs, type C-x b and switch to the *scratch* buffer (it should be the default option).
3) Paste in the following text (paste in emacs is C-y)

(require 'package)
(add-to-list 'package-archives
             '("marmalade" . "http://marmalade-repo.org/packages/"))
(package-initialize)
(package-list-packages)

4) Type M-x (usually Alt-x) and enter the text: eval-buffer
5) A list of packages should appear in a buffer, find haskell-mode and click the underlined text.
6) A new frame should appear with an "Install" button, click this, then confirm.

Haskell-mode should be now downloaded, installed and autoload when opening a .hs file.

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Old version of steps 3-4 above - try this if that doesn't work:

a) Paste in the following text (paste in emacs is C-y)

 (when (>= emacs-major-version 24)
  (require 'package)
  (package-initialize)
  (add-to-list 'package-archives '("melpa" . "http://melpa.milkbox.net/packages/") t)
  )

b) Place the cursor just after the final parenthesis (on the last line) and type C-j
c) Type M-x (usually Alt-x) and enter the text: package-list-packages