You could add a label to every point. Use something like Rob Bovey's XY
Chartlabeler (www.appspro.com) or John Walkenbach's Chart Tools (www.j-
walk.com).

You could then use an add-in to shrink/highlight the labels:
Hover Chart Label
http://www.tushar-mehta.com/excel/so...bel/index.html

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Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article ,
says...
If, in a scatter chart, each combination of X and Y has a name i.e. each XY
is age/income to persons. It would be easier to read the chart if you could
see the persons name by pointing at a XY-combination in the chart. How?