Rollyo is a great Web 2.0 tool that educators can use to create their own search engines for students, other teachers or personal use. Creating a searchroll for a specific subject with safe and relevant websites will save all users a lot of time and frustration.
I really liked the video created by Bruce Goodner. It was an excellent tutorial of how to create an account, set up your searchrolls but more importantly how to link it so that your students can use it as well. He's such a great example of how participating in 23 Things can help educators help their students and their peers with the knowledge gained.
I set up a library education search roll with links to websites that I've been using for our discussion questions and projects. I hope you have time to check it out.