MJD Red Flags series. Here's one, I haven't found where there's an index into all, but it can't be far (or by Google):
http://www.perl.com/pub/a/2000/04/raceinfo.html

Update: Don't know why this fascinates me so much, but here are some more "not quite what you want but may be helpful" links:

• http://www.cbs.dtu.dk/courses/27619/errors.html
• http://www.perlfoundation.org/perl5/index.cgi?mistakes_to_avoid (includes links to other MJD Red Flags articles)