In Lotus and in Excel you can alter the labels of the items in a legend.  This
cannot be done in OO.  If, for example, you want to chart items in a section of
a spreadsheet, the legend will say something like "Column A", "Column B", and so
on.  If you wanted to change it to "5 Wk Average" or "Mid Year Forecast" you
cannot.  The workaround is to delete the legend, and create text boxes, etc. 
But then you lose functionality the legend provides.