Originally Posted by Salathe

According to Internet World Stats, as of yesterday there were 964,289,701 people with 'net access. Nearly a thousand million people!

Also, according to W3Schools, 25% of visitors use 800x600 resolution. Note however, that figure is just for the w3schools.com website which is visited by people who are at least a little bit web-savvy so might not fairly represent the average person.