Since most of what I do is in print, I don't really consider myself an expert on TV advertising (I leave that up to some of the other guys here) but, as a consumer, I am overloaded on a daily basis with commercials.  So somewhere in the barage of pitchmen and jingles I find myself attracted to a few that are fairly well done that stay with me.

A few weeks I go I saw the "Amazing Grace" Salvation Army commercial and I thought it was pretty powerful.  I watch it every time it's on.
Watch the commercial on Youtube

Now for something completely different...
Most people that know me know that I love to draw little characters.  Tostitos came out with a commercial with a "Firesprite" that I can't stop watching either.  I'm not sure how effective the commercial is.  I haven't bought any Tostitos products since seeing the commercial but I did remember that it is Tostitos and I watch it every time it is on.  I even watch it on YouTube from time to time.  I don't know what it is about the commercial outside of the little characters that I like.  I'm also not confident that I understand exactly what is going on either, but I know that I love it.
Watch the Firesprite on YouTube

Enjoy!