DaveG goes to confession. I'm not Catholic but close enough.
What I've been guilty of:
1) Time Management - most of effort is in the first and last 20% of the project, the terrible middle 60%
4) Over-Automation - spending half the project writing new tools (more fun writing fuzzers than running them!)
5) Sloth - let the junior guy do the boring work
6) Stagnation - Cisco, anyone?