Nicole Calinoiu has started a (what I hope to be long) series on introducing Code Analysis (FxCop in particular) to your team. Her first couple of posts are absolute rippers, check them out:
FxCop and the big, bad backlog
FxCop backlogs: Some rules for rule activation
She's also written some custom rules content:
No rules in your FxCop rule assembly?
Rule: Justify rule violation suppression