Yahoo Search Pad is scheduled for public launch 04:00 GMT July 8, 2009. It tracks Yahoo web searches and will allow one to annotate them.
Look for it under the "Yahoo!" logo on a Yahoo SERP.
http://help.yahoo.com/l/us/yahoo/search/searchpad/

other coverage
PC World: http://www.pcworld.com/businesscenter/article/167944/yahoo_enhances_and_broadens_access_to_search_pad_tool.html
ZD Net blog: http://blogs.zdnet.com/BTL/?p=20723