There is no easy way:
Tricks: http://www.mcgimpsey.com/excel/conditional6.html
Add-ins (I can't reach it now): CFPlus you can read the text from Googles cache though.

Discussion forum link, http://www.mvps.org/dmcritchie/excel/condfmt.htm

The next step is paid add-ins, Excel 2007, or change to another spreadsheet supplier.

//Ola