Microsoft Office SharePoint Server (MOSS) Document Converters with Word & Excel 2007 on the server.
Converting Office 2003 file-types (doc, xls) to pdf and xps. Could easily be altered for work for docx and xlsx file-types.
Desktop Automation on the Server:
Previously, using office 2003 on the server to print out PDF files had problems. For example, if a dialog box pops up and no user is there to click 'ok' the instance will not close, additional conversions launch additional instances until the server grinds to a halt.
I have not seen this problem with Office 2007. I don't know why. I would love to hear a discussion about what is different with the COM interlope assemblies for Office 2007.
I have tried to use other 3rd party products to do document conversion. What I found is that rich content, with lines, arrows, circles, and so on, gets all messed up in the resulting PDF. Make sure you test with more than simple text when you build your converter on a 3rd part product!
Using Word and Excel 2007 to convert 2003 files to PDF and XPS seems to work great!
Typically document converters are just installed on the server running sharepoint after document conversion has been turned on. However it is possible to put document conversion on its own server by editing registry entries to point 'Document Converter Launcher Service' at the 'Document Converter Load Balencer Service' on the target machine.