I created a Rollyo search tool and added it to this blog (see below on the left). I included the links from the Holocaust pathfinder I use with students. I have titles and annotations about what is included in each site when I use this on a blog at school. This obviously didn't let me do that.
I can see helping teachers set one of these up for assignments where they want students to use specific websites. This task can also be accomplished on a wiki, blog or class site, but maybe this would be a way to keep these kinds of lists organized. Maybe it would be useful to organize lists of sites in a Rollyo and then paste the Rollyo on the wiki or blog? Maybe after I explore wikis more, I will have a better grasp of how I can use this or if I would want to incorporate it into a blog or wiki. I will have to explore it more to see if I want to use it with students. The directions on the site don't seem very intuitive, but you can eventually get it done.