This thread on the london perl mongers list elicited many thoughtful responses on this topic from many clever people. It's worth a read.

http://london.pm.org/pipermail/london.pm/Week-of-Mon-20071008/010290.html

The original poster started getting stroppy with the people helping him after a while, and the whole thing degenerated pretty quickly which is, IMHO, also worth a read.

f