There's been a fair amount of discussion here about various tools for slashing: lame, razor blades, serrated knives, scissors, etc. More often than not, I just touch up an already-sharp paring knife with a steel and slash the loaves with that. As long as the dough isn't too delicate, it works fairly well without dragging.
What I've been wondering, though, is whether an x-acto knife might be a useful tool. They could stand in pretty handily for a lame, it seems, since they have razor-sharp blades and a handle. Has anybody tried that yet?