I use the beer in a shallow bowl (I put out a half dozen bowls with at least with a sip for me if I use a 32 oz can - if you put an inch of beer in each bowl, that's plenty - scroll down this page
for my blog entry - it's the second one) several times a year. Howard has been talking about Sluggo, a snail and slug treatment that is organic. He said last year that when the cleared out the garden at the end of the season they found scads of the faded white snail shells on the ground - and he had been testing Sluggo.
I've been using it for a few weeks, and I notice they are attracted to it. I ran out, so I'll be picking up more tomorrow. The can says to sprinkle it in the areas you want to get rid of them every couple of weeks.