As a member of Garden Organic (used to be HDRA) I really do try, in all ways, to follow good organic practice, and so was an avid experimenter with each and every method of slug control to avoid using slug pellets. None worked very well, but a combination of torch-light slug patrols and beer traps (don't they get smelly if you forget them!?!) created a sort of stalemate.
Then one year I was looking through my Organic Catalogue (online too) and saw Advanced Slug Killer. I have to admit to being sceptical. Would they harm other life on the plot, what about slimy slug remains lying around, chemical residues and all the rest. So I looked into them and found that they are certified for Organic use and are not harmful to wildlife, pets, children, or me.
I have been using them ever since and would have to say that they work pretty well, I do still get some occasional slug damage, most noticeably on some potato varieties (yes I have tried Nemaslug) but I now feel we've moved from stalemate to an acceptable balance.