My tabs can get out of control, my vanilla start today had 24 tabs in Opera. That number grows, fluctuates and usually explodes by the end of the day.
On my main browser, Opera, I got the Jphip forum, mma-tracker, minus, tumblr and twitter always open. The rest come and go, but can linger for weeks or months depending on what I'm into or doing at the time...
I also use Chrome at the same time (because of convenience and a few extensions), with my mma betting site, some admin tools, sherdog radio and hattrick always open.