Creating MS Office documents from code

Oren asked his readers for a way to create Word & Excel documents without using COM.
I read the answers, and came up with this list:

Excel:
Essential XlsIO for Windows Forms
Aspose Cells

Word:
Essential DocIO for Windows Forms
Aspose Words
TX Text Control

I ruled out all OpenXML solutions, because they really work only with Office 2007.
Users of Office 2003 may be able to use them, but only after installing a package, and users of older versions (as well as Open Office users) can't read those documents.