MS added it in xl2002.

But Chip Pearson has a couple of versions (depending on what you're running) at:
http://www.cpearson.com/excel/download.htm
(look for Symbolizer and make sure you get the correct version)

KKilpatrick wrote:

There is currently no easy way to insert a symbol such as a degree sign in
Excel. It would be much easier to have a function like Insert Symbol from
Word to do this as one is typing rather than cut & paste from Word or using
the Character Map from Windows (outside of Excel).

--

Dave Peterson