Hands down, Dr. Bronner's Pure Castile Soap in Almond ($14) is one of my bath-time favorites. It might not be the cheapest of the bunch, but it has a rich, pure aroma that makes me want to linger in the shower longer than I should. But I don't, since I'm trying to be more conscientious about my water consumption, of course.
Besides the fact that this liquid soap is organic, it's not too gag-me sweet. Since the scent is natural, it doesn't linger around or smell fake all day, unlike certain overly perfumed products can do. My only complaint? At first I was annoyed by the runny nature of this castile soap (it's made purely from vegetable origin), but it produces a nice, foamy lather that is both film-free and moisturizing — so I've learned to deal. Oh, and if you're looking for hours of entertainment, I recommend reading the fine print on the bottle, where you can catch the philosophical rantings straight from the late Dr. Bronner himself.