I've worn headphones for most of my life in public...
I wore these for the better part of 10 years. They were re-terminated (2x) and the left cable was cut and re-soldered once because of a loose connection. I had some other vaious ones (namely some sony EarMuf like things that sounded like crap and had a really thin cord).
About 3 years ago I got some Sennheiser HD570s which I was planning to use in plublic but when it came down to it I was too embarrased by their size, found that they weren't efficient enough to drive with my portable, didn't provide enough isolation (for me and anyone around me) and to top it off they were the most expensive headphones I had ever owned.
Last year I bought some Sennheiser MX400 earbuds and to be honest I was very dissapointed with these. They didn't block out nearly enough sound when on the bus, they didn't have much in the way of bass response and they kept falling out of my ears. To top it off when it was cold out the cord would get very stiff and this would aggevate the problem with them falling out of my ears.
I bought some Shure E2Cs that I use now and these are great. I love having the cord behind my back and it's kind of funny when people will stand behind me and have a full (one way) conversation. They'll lean forward and i'll pull one out so I can hear them haha.
As for what i've seen. I've seen a few Sennheiser HD212s, tons of random buds, a fair number of ibuds and a few full sized Sony's. What I hate the most is when (mostly when I had the MX400s) I could hear someone else's music over mine, I am thankful for the isolation my Shure E2Cs povide.