Jeff,
In the cases where the user was using this particular UI they did not need to select large ranges of consecutive items. If they had wanted that feature I'd have taken the time to construct code that would have detected Click and ShiftClick and select all the rows in between.
>PMFJI Dave but multi-select listboxes are great because you can select several items with one click by holding down the shift key. This interface is also consistent with apps like Explorer etc.
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>You are denying your users of this capability by making them painstakingly click inside hundreds of little checkboxes and causing them undue hardship and aggravation.