From a smackdown of Strunk & White in the Chronicle:
The Elements of Style does not deserve the enormous esteem in which it is held by American college graduates. Its advice ranges from limp platitudes to inconsistent nonsense. Its enormous influence has not improved American students’ grasp of English grammar; it has significantly degraded it.
Personally, I’m a big fan of Garner’s Modern American Usage, famously and brilliantly praised by David Foster Wallace in a review in Harper’s (“Tense Present“).
The Hardest Science 