in reply to Useful non-Perl-specific references
Practical stuff:
McConnell's "Code Complete" etc
Knuth or similar
Pointy stuff:
Demarco's "Peopleware"
McCarthy's "Dynamics of Software Development"
Hard stuff:
Watt's Humphreys' "A discipline for software engineering"
When the going gets hard stuff:
Yourdon's "Death March"
Anything by Stephen Covey
Anything by Scott Adams