Rollyo provides a search engine that is customized by you. It is easy to register and copy favourite urls into a search engine. I registered and loaded some Breast Cancer websites from my bookmarks and then added the searchroll to my blog. This was very easy and I can see that it would useful to store favourite sites and add them to a blog or elsewhere.
I am currently also working on a blog for some breast cancer women who want to tour South Africa. I can imagine using this this tool to put together some useful sites on that blog.