"Out-of-the-box" screen rez

When last I was seriously involved in testing Web sites across 
browsers/versions/OSs, the Windows OS "out-of-the-box" (whether OEM or 
disk) was set to load with a default screen resolution of 640x480 
regardless of monitor size.  And, of course, for the mass market many 
people simply did not change or know how to change the rez to a higher 
pixel density - many probably still don't.  I would appreciate any feedback 
on the current default resolutions for Windows ME, XP and 2000 - 
generally.  Has it moved to 800x600 or are there different rez defaults 
across these OSs?  And, lastly, what is the default(s) for the Mac?  My 
target market is primarily Windows-based, with a few on Mac, therefore 
other OSs' specs are irrelevant for my needs.

TIA, Ralph Rasmussen
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R & L Rasmussen      ideas(at)cfl.rr.com

"I have learned more from my mistakes than from
  my successes."      Sir Humphry Davy
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