It's currently not possible to enter keywords in a new bug report on
http://bugzilla.gnome.org/enter_bug.cgi. Keywords entered in the keywords field
will happily be ignored by Bugzilla.

To enter keywords, one currently has to first create the bug report using
enter_bug.cgi, then revisit the bug report using show_bug.cgi to fill in the
keyword values. Again.

Steps to reproduce:
Try to add a bug report using http://bugzilla.gnome.org/enter_bug.cgi. Enter
some keywords on the "This page lets you enter a new bug into Bugzilla" screen.
After the bug has been added, visit the bug report and watch the keywords field
being empty.