Cuil has updated it search results page, which is now include related story in timelines.

For instance, you want to know how iPhone started and the related news and update.  Just run query for iPhone, and it will shows the results as well as the timelines box at the top right of the search result screen.

Resize the windows to get the bigger views where you can see the stories are sorted by its date. You can specify for which period that you want to view as well.

However it seems like that, the timelines is available for US related keyphrase only.