I've just moved onto IE7 but I've discovered that CCleaner doesn't clean as well as it used to. For example, the search history in the new search bar is not clearing. I am getting an ever expanding lisgt of previous searches.
It has been discussed quite a lot on this forum recently and unchecking "delete index.dat files", and not having ccleaner run at startup while using IE 7, will solve the cookie problem for now until ccleaner becomes fully compatable with it.