This looks like it could come in handy for something!
http://mattkruse.com/2008/12/24/php-excel-reader/
Probably reading excel sheets, thats just a hunch tho. I could be wrong. Will try to hook it into a TinyMCE addon to make table embedding easier for clients.
Found a better library for integration, also reads into the zipped goodies of xlsx.
Take a look at http://www.codeplex.com/PHPExcel
