Ugh... well, don't drop it if you don't have to. If the W's were spaced out, it won't look too bad, but especially during your final year or so, you want to get as few W's as possible. I had 6 and it didn't come up at my interviews - but you don't want to shoot yourself in the foot.
Do you have a good reason for dropping the class? If you think you're going get a C, maybe, but other than that, I wouldn't drop it this late in the game.