BackTrack 4 is in pre-release and it’s a beautiful system. However, there seems to be a problem where after your first apt-get upgrade, the system will try to load Apache, PostgreSQL and other daemons on startup. Not exactly what you want when you want a clean system. To turn it off and prevent autostart:

sudo update-rc.d -f apache2 remove
sudo update-rc.d -f postgresql-8.3 remove
sudo update-rd.d -f dhcp3-server remove

This way, you can go on doing your thing without anything that leaves you open