Unicornscan is an awesome "payload sender" which can also act as an asynchronous scanner. Thanks to dash1b and his awesome patch-up script, we were able to quickly implement the full features of the scanner in BackTrack 5. To install unicornscan on BackTrack 5 (if not already installed), type:
root@bt:~# apt-get update root@bt:~# apt-get install unicornscan
Next, run the postgres-setup script, which was taken mostly from http://code.google.com/p/unicornscan-bt5-install-script/. This script will setup the Framework3 PostgreSQL server as the DB back-end for Unicornscan.
Start apache, and browse to http://127.0.0.1/unicornscan. Initiate a scan using the -epgsqldb option.