Generating entropy quickly

I wrote a script to generate passwords for users, but it runs very slow at times. The solution was to install rng-tools.

From http://www.101tech.net/2011/11/01/apg-automated-password-generator-runs-slow-on-centos/

# apt-get install rng-tools
# echo "rngd -r /dev/urandom -o /dev/random -t 3" >> /etc/rc.local
# rngd -r /dev/urandom -o /dev/random -t 3

EDIT:
After reading this posting by Theodore Ts'o maybe using this isn't such a great idea as it is basically a bridge to the possibly compromised RNG instruction in the Intel processor.