I have submitted the ODF Viewer to the following sites:

http://freshmeat.net/ -- listed
http://opensourcemac.org/
http://opensourcewindows.org/
http://www.versiontracker.com/ (both Mac and Windows sections) -- listed
http://osx.hyperjeff.net/Apps/
http://www.autopackage.org/packages/

Some (Alex or Daniel, probably) previously added it to this page:
http://developer.mozilla.org/en/docs/XULRunner_Hall_of_Fame

I will update this blog entry as I do more submissions.