Whatever little I've seen so far bing could actually change the way we search. I doubt it will be another Cuil. Though personally I don't mind Cuil. Its another interesting approach to search. I use it every once in a while.
I will try and add bing the day it is launched. It just might be reason enough to change the default search engine from Google to Bing. If nothing else I might have to think of adding a feature to change the default search engine soon enough. But I guess I will have to wait and see how things work out.