Up util now, I've only used two add-ons, Carbonite and Auctioneer (the latter currently disabled because I'd rather do it myself.
Lately I've been wanting two more, one to display multiple action bars (like you see in how-to screen shots) because the one I need is never visible, and the other a damage counter since it seems to be useful in dungeons.
So, I went out to look for them and there can't possibly be more than 300,000 competing versions of both (OK a slight exaggeration).
How do you go about finding a good one without spending many hours downloading and trying various offerings - i.e. anybody know which ones are the best and want to share the knowledge?