It was more helpful to me to go check out what other folks said about Roll-yo. I noodled around with it for a little while, but it seemed to be another piece of the 2.0 puzzle that created more work for us librarians. It does seem like an effective way to create very specific ways to search for specific things. Additionally, it could be an organizational feature for library-recommended sites in general. But how does this differ from delicious? I know it's a different way to organize, but I am not sure if it would be redundant with all these other wonderful applications. I guess one just has to decide which works better for the community.