Maybe you already knew this, but Wise (known for their famous Wise Package Studio) has a free version MSI editing application called "InstallTailor".
http://www.wise.com/installtailor.asp?bhcp=1
...besides Wise, there's others:
MaSaI Editor
http://www.masaieditor.com/html/editor_home.php
WinINSTALL LE 2003
http://www.ondemandsoftware.com/freele.asp
..and if you own MS SMS 2003 server, there's a free Adminstudio version:
http://www.microsoft.com/smserver/downloads/2003/featurepacks/adminstudio/default.asp
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The tart is out there
