For a while now, there has been a debate raging between web developers on whether or not to still support the 800×600 monitor resolution. As of today, my site still supports 800×600, evan though only about 10% of my visitors have their monitors set to that resolution. Globally, I’ve heard that 800×600 is still used by about 25% of internet users.
I was browsing the Apple site today, and realized they took the plunge at some point. At one time all of the Apple site was compliant with an 800 pixel wide monitor. Some portions of the site still are, but most of the pages now require at least 1024×768 (the most common resolution).