I work for clients with customer demographics who have diverse enough equipment to necessitate that I still build [websites] in 800x600px. 800x600px would be about 3x1.8" on new hi res displays - not very functional.? Any thoughts?
There's a solution that some people use, but it's not gonna put a smile on your face. You can create different versions of your website that are optimized for different sized resolutions, then put in code to first check the monitor resolution the computer is running, and then have the server send the version of the site optimized for that particular resolution.
It's a kludge to be sure, but at the moment it's the only way to do it that I know about.