Nessus is vulnerability scanner that has web-based interface. You can use it to improve your backtrack funcionalities.

1. Install from apt-get
# apt-get install nessus

2. Follow the instruction displayed (add user). this user will be the administrator user, you can add other type of user later
# /opt/nessus/sbin/nessus-adduser

3. Register to nessus.org to get your activation code. if you have received it, run this command
# /opt/nessus/bin/nessus-fetch –register

4. if this procces doesnt run well, it may be caused by wrong proxy configuration. setting proxy configuration on nessus-fetch.rc will solve it

5. Upgrade your nessus
# apt-get upgrade nessus

6. Run nessus daemon
# /etc/init.d/nessusd start

7. Open your browser and enter https://localhost:8834/
you may login to nessus now.