Slugs and beer: I think it just attracts more of'em.
Hanging baskets: I've seen slugs crawling up the side of the house well up on the second story.
Eggshells, crushed: only the little slugs fear them.
Coffee grounds: works, but you have to drink a whack of coffee and renew constantly.
Copper barrier: works, but is expensive.

Lordy I hate slugs.