Roll, Roll, Rollyo search engine

Rollyo is a tool that is new to me. I can see all sorts of applications for it, especially at the reference desk. As you can create many different categories of customizable search tools. Rollyo would be especially handy for ready reference questions. You could make up several categories, for entertainment, government, news/current events, sports and so and so forth. With an account the Rollyo search engines you create are easily edited. At the reference desk this could be an incredibly helpful tool for narrowing searches rather than automatically painting with the broad Google brush. They also have also sorts of rolled search engines other users have created that can be stimulating for ideas or good links. Here's mine.