Vivisimo is a very cool search engine that someone (who's blog is down right now... JOE) showed me.

It categorizes your search results on the left and lets you browse by topic.  It also has links by each search result that allows you to open a link in a new window, in a frame, or preview it in a collapsible IFrame (very cool).  The one thing that it is missing that I use a lot in google is viewing a cached version of a page (great when someone's website is down).

They also have a toolbar that has a popup blocker kind of like google's.  They call that Clusty and it uses a search result page that looks slightly different.  I am not sure the reason for that.

I will try it out for a while and let you know my results...