I have two:
One was for Gen Biology I - I dropped it junior year because I decided for awhile that I didn't want to go into medicine (I was a chemistry major). I wound up re-taking biology senior year (same school) and got an A in both classes.
The second W was for Spanish. I took advanced spanish comp. and conv. senior year as an overload (extra course) but the professor was giving me C's on my papers even though she was telling me how well I was doing. I decided to give it up rather than take a C on my transcript. I am planning on taking Spanish again at a SUNY this coming spring and have listed it as Current/Future coursework on AMCAS.
I'm going to mention the W's on my essay, but I'm afraid some schools will just use them to exclude me from an interview.
Anyone have any opinions, thoughts, etc? Thanks.