I think as far as preflop raises go, Tom McEvoy's strategy of raising 3x the BB plus 1 BB for every limper is the best way to go. I'll go 3x + whatever for every limper up to 3, if there's 3 or more limpers then I'll just make it 6x and see what happens. I think that's probably the best way to play "defensively" yet still encourage action from some weaker hands.