Browser res­ol­u­tion stat­ist­ics (Jan, 2010)
1024x768px or high­er: 96%
via w3schools.com

View­port size
990px wide x 560px high
via googlelabs.com (now a part of Google Analytics)

Flash Play­er Pen­et­ra­tion (Mature Mar­kets, March 2010)
Flash Play­er 8 & below: 99.3%
via adobe.com