If I ever become a link list...
We can all do with a few tips on overcoming life's greatest challenges: Becoming an evil overlord, becoming an anime character, becoming a vampire, being an innocent passer-by in the battle between Good and Evil... These links can help you overcome your personal challenges and/or die in style.
The Evil Overlord List - the granddaddy of all "If I Ever" lists. All hail Peter Anspach!
Things I Will Do When I Become Evil Empress - Also contains advice for evil geniuses and scientists, aliens and monsters on the rampage, and the non-gender-specific evil at heart, plus tips on fortress construction, ultimate weapons, and alliances of evil.
The Evil Henchman's Guide - also the Evil Overlord's Wicked but Beautiful Daughter Guide and the Evil Overlord's Accountant Guide.
Magical and Greebly Things
Things I Will Do If I Am Ever the Hero - also translated into French and German.
General Guides and Tips
The Laws of Anime - Study this hard.