Rollyo vs. Advanced Searching

I am a big fan of getting the most bang for the buck, whether it's learning all the features of my PDA, digital camera, or my PC. Effectively utilizing search engines, whether they are database search engines or web search engines (e.g. Google), really make a big difference in the quality of search results.

The Rollyo utility seems to me to be like using an Advanced Search feature limiting result to those from certain domains, or particular websites. I have to play around with Rollyo more to figure out how much more there is to it.