Where else? Update this checklist if other sources are found so that we won't forget them in future.
Be prepared for Google's announcement:
Have the web pages done before the application period so Google can audit them.
Get our application in to Google immediately, so they have plenty of time to look us over and confirm that we are a viable candidate.
Advertise our participation to drum up more submissions. We will be listed on Google's own heavily-advertised web pages, but there are plenty of other places:
Mailing lists (scons-users primarily, but also scons-dev).