Project that allows you to layout page in postscript : http://www.unifont.org/lasi/

Example how to print postscript in windows:
http://cybertiggyr.com/psw/
http://cybertiggyr.com/psw/print-postscript.c

How to print on unix – cups:
http://www.cups.org/doc-1.1/spm.html#1_1

excel read/writer:
http://www.codeproject.com/KB/office/ExcelFormat.aspx

OOo library ?
http://wiki.services.openoffice.org/wiki/Documentation/DevGuide/Spreadsheets/Working_With_Spreadsheet_Documents

2010-11-18 09:53:27
http://www.libxl.com/ – excel

2011-02-08 09:55:00
printing to PDF:

http://libharu.sourceforge.net/
http://podofo.sourceforge.net/about.html