Recently while looking through all my audio accessories, I discovered that I accumulated three different types of earphones and one set of headphones. Each are rotated based upon the activity I'm using them for. It made me wonder if most people have several listening accessories (earbuds, earphones, headphones) or rely on one that does it all.
Exercising
While I'm exercising I like to use my earbuds from Daiso. They were really cheap so I don't mind taking them to the gym or going running with them since they're easily replaceable. For affordable earbuds, they're still really comfortable and extremely light.

For Working
While I work, I alternate between earbuds and AiAiAi headphones depending on what type of work I'm doing. If I can listen to music but still need to have one ear open to keep tabs on what's going on around me, I defer to my earbuds. They're easy to access if I need to listen to something quickly.
However, if I know I'm going to be working on a project I need to concentrate on and don't want to be bothered, I put my AiAiAi headphones on.

Commuting/Easy Listening
When I used to live in Boston, I would always walk to places or use public transportation and I would oftentimes use earbuds because they're easy to take off when you run into a friend on the street. It was also more convenient to drop them in my bag or pocket. Most friends however, definitely preferred headphones while commuting, saying that it made the trip more pleasant with a high quality listening device.
In the end, I definitely need both earbuds and a good set of headphones.
Do you own both or have one set of earbuds or headphones that do the trick for all your needs?

White Enamel Four-P...
For Commuting, I am currently using the Golla Superbees</a href>. However, I'm not liking them as they constantly get knocked out when other commuters pass by. Any good recommendations?
For work, I use the Panasonic RP-HTX7</a href>, which I absolutely love. These cancel the right level of noise, but allow me to hear what's going in my surroundings if need be. The sound is solid and the headphones are quite comfortable!
Wow, sorry. First time commenting and clearly didn't get the tags right.
For computer use, I have an ancient Koss noise-cancelling set, scored at a regional highway yard sale, that gives me excellent sound, has independent volume controls, and has a cord heavy enough to tow a truck. On the treadmill or for cleaning carpets, Sennheiser earbuds with inline volume control keep out enough noise to allow me to hear the phone or doorbell, while still preserving music quality. For iDevice videos, a pair of Altec Lansing Bliss Platinums fit my ear better than anything else I own.
On my active physical job, which destroys earbuds, I use up a pair of cheapies every few months.
I like earbuds. Most are cheap, light and the rubber makes some noise isolation, so I think they're a must. I like Urbanears for its colors and design. They're not the best regarding sound, but are stylish and relatively cheap. The Urbanears Plattan in Moka look good, have a built-in mic and button to play/pause and control Siri con the iPhone. They're good for working, listening to music on the couch or even walking. Since they're foldable and have a headphone out port, they're great for travelling and sharing music or movies. I also have a new pair of Urbanears Bagis in Indigo, whick also have the mic/button thing on the cord and the buds themselves can clip to each other avoiding the regular tangling of most earbuds. The sound is good, in both models, at least better than Apple's and most on it's price/category, and I love the fabric cord, seems durable and helps avoiding the tangling too.