A post on how to randomise a list with ColdFusion: http://www.aliaspooryorik.com/blog/index.cfm/e/posts.details/post/create-a-random-list-in-coldfusion-38
*update*
I’ve found a comprehensive post by Ben Nadel about this:
http://www.bennadel.com/blog/219-Randomly-Sorting-A-ColdFusion-List.htm