Inspired by Dylan Stiles' tribute to sodium ethanethiolate, I present Lowe's Guide to Sulfur Aromas:
Hydrogen sulfide: rotten eggs. No more, no less, and plenty of them. Rather more toxic than cyanide, but at least you can smell it coming more easily.
Dimethyl disulfide: not, as these things go, really all that bad. If you smelled it coming out of your refrigerator, you wouldn't be pleased. But compared to the others on the list, it's tolerable - perhaps the cleanest of the sulfur odors. And many organic chemists associate it with a successful Swern oxidation, which gives it some points.
Ethanethiol: the prototype of the class. All the basic sulfur-stink notes - skunky and intestinal. Very volatile, too, which really gives it a quick wallop, but at least it doesn't stay around forever. I had a grad school reaction that used this stuff neat as the solvent, so I know whereof I speak.
Cyclopropanethiol: not sure if you can buy this, but we made it in my lab a few years ago. Smells like a fire in a garlic warehouse - very sharp and penetrating. Notably different from its acyclic brethren.
Propanedithiol: two SH groups in one! Has the same general character as the other lower alkylthiols, but with a darker, more penetrating note. Lasts forever due to its high boiling point.
n-Butylthiol: since butyl groups reek in general, the butylthiol has a special kick all its own. Very rich and skunky indeed, and it sure does hang around.
t-Butylthiol: used as the odorant in natural gas lines, so you know it has something to recommend it. Nasty and overpowering at 100% concentration.
beta-Mercaptoethanol: rather similar to ethanethiol, but the extra OH group gives it some real staying power. Sort of the "sun and sport" version of the parent compound.
Mercaptoacetic acid: ugly, sharp, acrid reek, also with plenty of endurance. Nothing to recommend it.
Thiophenol: you've smelled it, if you've smelled burning rubber. But imagine the pure essence of burning rubber, distilled and bottle for your pleasure. Very long-lasting, too.
Mercaptopyridine: since pyridine reeks to the skies, and thiophenol is so awful, you'd expect the worst from this combination. But it has no smell whatsoever, by some trick of fate. Surely that's for the best.