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Err, if the chart looks like it's supposed to then your monitor is now calibrated correctly. ;)

Well I do have 3 pretty good monitors now, all 24" Acers. I've checked out the charts, plus Windows 7 has a built-in calibration utility (in display properties), and everything looks great, so I'm assuming my calibration is correct.

But even with my 4 year old 19" Viewsonic CRT monitor I can get the gamma charts looking good, yet I still think the gamma is off on that one.

It seems to me that the best you could do with a chart or a utility is to get it relatively correct; your white may look white and your black may look black, relative to its own abilities, but you can't really know if your white is pure white and your black is pure black. If that makes any sense.