25%+ are still using 800x600 so it's probably too early to ignore them and 770-odd pixels is the maximum visible with a vertical scroll bar at that resolution. I think it looks better not to entirely fill the screen, so I usually work within 750 pixels.
To cope with all the resolutions, when you aren't restricted by graphics, it's much better to work in percentages: not just for the table dimensions, but for text sizes too. That way you keep everyone happy.
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