How about the smell of frying onions? The smell of a shoe-repair shop? I agree with the other commenters about the smell of hardware shops. Or the scent of jet fuel, as described so poetically by Jerry Haines on World Hum: http://www.worldhum.com/speakers_corner/item/fueling_desire_20060819/
This is one of my very favorite things at the Smithsonian (at the Museum of American Art) and photos do NOT do it justice-- you gotta see it in person.
"Chatty seat neighbors are a bane to the traveler who likes to be left alone. What to do? Look no further than the Inflatable Travel Pillow. If your neighbor seems like the talkative type, simply take out your ITP and start blowing. During the 30-45 minutes it takes to inflate, you'll be unable to carry a conversation. When you're done, simply flop forward and enjoy a restful sleep on this classy vinyl colossus." --Sky Mall: For the Shameless Traveler
http://intelligenttravel.typepad.com/it/2007/12/biagio-bacon-fo.html
http://www.worldhum.com/speakers_corner/item/fueling_desire_20060819/
http://ngm.nationalgeographic.com/ngm/photo-contest/people.html
http://www.banterist.com/archivefiles/000530.html
http://www.banterist.com/archivefiles/cat_playmobil.html
http://www.youtube.com/watch?v=rlx1fFAgLJs&mode=related&search
--Sky Mall: For the Shameless Traveler
See more funny reviews of Sky Mall products on Banterist:
http://www.banterist.com/archivefiles/000340.html
Have you seen this hotel made of salt in Bolivia?
http://bldgblog.blogspot.com/2007/08/one-or-two-nights-in-sodium-hotel.html