Tomorrow is the release date of the official version of Firefox 3, and to boot it off they are having a download campaign. If you have an older version of Firefox, download it. If you don’t have Firefox *shudder*, download it.
I have been using the beta/release candidates for over a month, and the features and speed has been greatly improved over previous iterations of Firefox, so you really are doing yourself a disservice if you do not download Firefox 3 tomorrow.