What is REVU? According to the Ubuntu REVU wiki page...
REVU is a web-based tool with which contributors may show package changes to Ubuntu Developers for review and inclusion into Ubuntu.
When a package is not already included in Ubuntu (or Debian for that matter) then it must go through a vetting process before it can enter into the Ubuntu archives and available in the official repositories. REVU is that process.
I am hoping to get this approved for inclusion into Lucid. Maybe even a few others as well.