The question arose in relation to finding the selected cell when someone searches for information in a spreadsheet.
I thought there might be something in accessibility, but I don't see anything helpful.
The only thing I can think, if the person is using 2007 or 2010 with the ribbon, would be to do the search and click one of the "cell formatting" options in the ribbon to make the cell stand out, then do ctrl-z to undo the formatting. That doesn't seem like a really good workaround, though.
(crossposted to various places, including my own LJ, my Facebook, and my IAAP chapter listserv)