Windowed all the time .....
The only times I really ever maximize the browser are
1) if I'm using a craptastic 14inch or smaller CRT that can only do 800x600 ....
2) If the webpage doesn't fit right on my laptop screen ... ie .. if I have to horizontal scroll, I will maximize it as my lappie only goes to 1024x768.
at home, I am running 3200x1200 on one PC, 1600x1200 on another, 1280x960 on the other, and 1024x768 on the lappie .... I hate how my browser looks maximized ... I will often have 2 browsers open ... each with tabs ... one on each monitor .... however, never maximized.