I was having an issue the other day and successfully got a very good answer which helped me alot achive what I wanted. this is the post which I created and have all the correspondence:
The answer was kindly contributed courtesy of @Sagive SEO
This script currently displays all authors in an order of most posts written.
I would like to change it to simply display all authors randomly regardless of how many posts they wrote.
Hope to get an answer, thanks a lot Gil