Each semester I work with 9th graders to research a natural disaster of their choosing. The students use print and non-print sources to locate details such as: causes, effects, benefits, safety precautions and other scientific facts. Typically I provide a pathfinder for the students which includes some recommended web sites. I like the idea of using Roll-yo to provide a one stop shop experience for using web resources. http://rollyo.com/mwells2920/natural_disasters/ I especially like that you can create a search widget. This is very handy if you want to embed your search bar into a wiki or website.
Unfortunately, I was not completely satisfied with Roll-yo. It was far too slow to do any function, particularly the search. I can't imagine teenagers waiting as long as I did for searchroll to conduct a simple search. I consider myself patient person, but the length of time it took to do anything was a bit ridiculus.
In the past I have used Google's Custom Search to create searchrolls and I've been very satisfied and it didn't take nearly as long to accomplish the task!