Me? A good 10-12 per here. Sometimes more. It's not often less.
Two.
1. Always NSFCD
2. Always Youtube
I rarely open the third. Ususally used for school work or to look at a site.
2, sometimes 3.
NSFCD, Facebook, and sometimes Myspace.
There will often be another for something else.
5. I don't have particular one like you guys. Instead, I just know I have 5 open most of the time. >_>
4 or 5.
NSFCD, 4chan, Lockerz, server admin panel, and Gmail.
Sometimes other things too.
3 or 4.
NSF, SPUF, Facebook, Formspring.
Here, sometimes Facebook, reddit, last.fm
usually between 2-5.
Facebook always, then here sometimes, as well as my e-mail, and sometimes a few more pages i wanna remember but am too lazy to bookmark.
one sometimes two
Anywhere from 1-4. If I have four open, then all of them are NSF. If I have two open, it's usually NSF and TVtropes/Youtube.
3-5 in FF and 3-5 in Chrome.
Two or Three. If I'm not using it I like to close it.
2-10
Depends.
I don't have that many tabs open usually. Mostly around 3 or so.