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The most common screen width has been 1024 for quite a while. And 800x600 is definitely declining fast these days. A year ago I was seeing nearly 30% at 800 and now it's more like half that -- say 10% to 15%.
But if you're designing for a fixed width, the question is this: How much of your traffic can you afford to give a side-scroll? Even 1 in 20 seems to be a pretty big loss to me, so I still use 760 pixels for my fixed width designs.
In other news, many people (like myself) don't use their browsers maximised, so working by resolution isn't actually that helpful. I'd suggest that you take 770px as a resonable minimum, use liquid layouts if you can, and if you can't and still need more width make sure the stuff that's off the side is unimportant (like a skyscraper ad or something).
1024x768 for teenage.
800x600 for business man and old People easy to read.
Laptops are actually getting smaller and smaller and even though a 12" screen might support 1600x1200, I think most prefer 800x600 on such tiny screens. I personally wouldn't want the resolution over 800x600 unless the screen was at least 17 inches.
With the price of 800x600 projectors dropping like crazy (I paid $1000 for mine a couple years back and now it is only $700), I think it might open up a small market of 800x600 web surfers. I enjoy surfing the web on my 100" 800x600 screen and I hate websites that don't support it.
I don't know of anyone that doesn't maximize the window they're using. Those of you who say otherwise are strange to me, :)
I never build a fixed width larger than 700px. I try to keep it at 650px.
#container {
min-width: 770px; /* minimum readable for 800x600 screens */
width: 100%; /* make the site liquid to the screen */
max-width: 1000px; /* but stop at a sensible maximum */
margin: 0 auto; /* and center past that point */
} I played around with various 'expression' fixes for IE but gave up after a while - they proved massively unstable in standards mode. At the end of the day it's a nicety to users of up to date browsers, and hopefully when IE7 comes out MS will have implemented min/max-width so the majority of users will get it as well.
That allows 800 x 600 and 640 X 400 the ability to read it.
You really need to look at the lowest common denominator of screens, even if you have a high tech one, it doesn't mean others do as well.
However now I use mostly 3 column css with the center column expanding and contracting to fit the screen.
Firefox has a developer tool that allows you to quickly select the screen size you want to see.