Google announced four new products following its yearly Press Day event yesterday. The new additions include Google Co-op, Google Trends and Google Notebook (launching next week). The company is also introducing version 4.0 of its Google Desktop, adding multi-purpose "Google Gadgets" similar to MacOS X's Widgets and Windows Vista's Sidebar Gadgets.

Google Co-op - Lets people and organizations label web pages and create specialized links related to their unique expertise. Whether it's information about a hobby, a profession, or an unusual interest, everyone can contribute to making Google search more relevant and useful for the entire community.

Google Desktop 4 - Google Dekstop gives you another way to improve search, by personalizing your desktop. New "Google Gadgets" deliver an array of information--ranging from games and media players to weather updates and news--straight to your desktop.

Google Notebook (launching next week) - Is a personal browser tool that lets you clip text, images, and links from the pages you're searching, save clippings to an online notebook, and then share notebooks with others.

Google Trends - Google Trends builds on the idea behind the Google Zeitgeist, allowing you to sort through several years of Google search queries from around the world to get a general idea of everything from user preferences on ice-cream flavors to the relative popularity of politicians in their respective cities or countries.