If you’d like to disable the project listing (“Available projects”) in Trac 0.8.4 when using mod_python (highly recommended as it greatly improves Trac’s responsiveness), you might want to use my tiny patch:
Apply it by executing
# patch
in Trac’s source code directory (see the result of ‘locate Changeset.py’). On Gentoo, the directory is /usr/lib/python2.3/site-packages/trac/. Note that you don’t need this patch if you’re using the current trunk version of Trac (at the time of writing). In trunk, you can define your own custom template for the project listing.