Well, I created two search tool using Rollyo--for what it's worth. The first was "Art Reference" and it included an anime site, IMDB, IBDB (Internet Broadway Database), and a Rolling Stone reference site. This was a pretty minimal search roll, I'll have to admit.
As I got to thinking about the uses of a search roll, I thought of a more relevant one for us and libraries. I created one called "Southern Maryland" that had sites that allowed for searches of various Southern Maryland sites. This is the type of use a Rollyo account and search roll might have for a library--creating local search rolls for customers.
Also, Rollyo has a lot of canned sites that could be useful for library patrons if access were permitted.