Chloraseptic: the granddaddy of numbing your throat. It contains a healthy dose of something-ocane, and it's the most effective of anything I've tried.
Fisherman's Friend: a close second to Chloraseptic, but it contains menthol rather than whatever-ocane. They taste like they should be stronger, but they aren't. I'm half-convinced that taking too many of these actually burned my mouth and throat.
Ricola: not a whole lot of kick, but effective on relatively minor sore throats and coughs. They're much friendlier and more pleasant to take than either of the abovementioned sledgehammers.
Altoids: not technically a cough drop, but effective on minor coughs and sore throats.