If you have not seen it, check out Tafiti. Tafiti is a swahili word, meaning “Do Research”. If you are tired of doing searches where all the results come back in a spreadsheet, then Tafiti is your solution. It will allow you to graphically view all of your search results, save some of your favorites and even see a “Tree View” of search results. I am including a nice instructional video for you.
Did I mention that it uses Silverlight?