Hi
I believe it is a good practice too keep each line short and easy to read. The following is taken from python style guide.
Maximum Line Length
Limit all lines to a maximum of 79 characters.
There are still many devices around that are limited to 80 character lines; plus, limiting windows to 80 characters makes it possible to have several windows side-by-side. The default wrapping on such devices disrupts the visual structure of the code, making it more difficult to understand. Therefore, please limit all lines to a maximum of 79 characters. For flowing long blocks of text (docstrings or comments), limiting the length to 72 characters is recommended.
http://www.python.org/dev/peps/pep-0008/
P.S. We really need such a well written style guide for haskell. Python has this nice PEP (Python Enhancement Proposals). Should we start making our own HEP?
We have one: urchin.earth.li/~ian/style/haskell.html