Handy tools recently released from google

Google Notebook
Google Notebook is a free browser tool that makes web research of allkinds-from planning a vacation to comparison shopping to purchasing acar-easier and more efficient. It allows you to send clippings oftext, images, and links to an online notebook without ever leaving thepage you're on. You can also add your own notes, organize notebooksinto sections, and make your notebooks public for others to view.http://www.google.com/notebook

Google Co-op
Google Co-op improves search for everyone by allowing people to labelweb pages relevant to their areas of expertise and create specializedlinks users can subscribe to. So, for example, if a you're a doctor whoknows a lot about arthritis, you can label web pages related to thedisease, and other Google Co-op users who subscribe to your informationwill receive new search refinement options (such as "treatment,""symptoms," or "for health professionals") at the top of their resultspage when they enter a relevant query.http://www.google.com/coop

Google Trends
Google Trends enables you to compare the world's interest in yourfavorite topics. You can enter up to five topics and see how oftenthey've been searched for on Google over time. Google Trends alsodisplays how frequently your topics have appeared in Google Newsstories, and which geographic regions have searched for them mostoften.http://www.google.com/trends

for example, http://www.google.com/trends?q=ibm%2C+microsoft%2C+google&ctab=0&geo=all&date=all