According to
http://whatsmy.browsersize.com
Screen: 1680 x 1050
Browser: 1068 x 775
I moved it to 1111 x 777 for oddball numerological reasons but just the small difference makes it seem too wide for me, so I'm reducing it again. I get irritated by too much space either side of page content.
960 or
978 are considered to be good widths for web design, I believe.