Yahoo is adding a new feature called "Search Pad" in "Yahoo! Search". Currently it is still in the testing stage and not available to the public. Search Pad detects a user's research intent and records the visited sites automatically.  The Search Pad is integrated in Yahoo! Search unlike Google Notebook. So, notes can be added and organised from the Yahoo! Search interface itself. Users also have the option of storing the notes for future use using their Yahoo! ID. However the notes cannot be shared publicly, they have to be emailed to share. For more information and a video demo check out the Yahoo! Search Blog.