I just helped someone out on the BACFUG list concerning a misleading doc page for isUserInAnyRole().
The docs mention that you can use the function to test and see if a user is in one of a list of roles, but it also implies you can use it to see if a user has any roles at all:
<cfif IsUserInAnyRole() >
<cfoutput>Authenticated user is in these roles: #GetUserRoles()#</cfoutput>
<cfelseif >
<cfoutput>Authenticated user is in no roles</cfoutput>
</cfif>
This code won't run as isUserInAnyRole must have at least one argument, which is a list of roles to check against the user. Here is an example showing correct usage. The output will be YES.
<cfloginuser name="ray" password="parishilton" roles="a,b">
<cfoutput>#isuserinanyrole("b,c")#</cfoutput>
I posted a comment to Livedocs, but I don't see it online yet.