This excerpt taken from the GOOG 10-K filed Feb 15, 2008.
Google Desktop. Google Desktop lets people perform a full-text search on the contents of their own computer, including email, files, instant messenger chats and web browser history. Users can view web pages they have visited even when they are not online. Google Desktop also includes an enhanced, customizable Sidebar that includes modules for weather, stock tickers and news.
Google Pack. Google Pack is a free collection of safe, useful software programs from Google and other companies that improve the user experience online and on the desktop. It includes programs that help users browse the web faster, remove spyware and viruses and organize their photos.
Google Toolbar. Google Toolbar is a free download that adds a Google search box to web browsers (Internet Explorer and Firefox) and improves peoples web experience through features such as a pop-up blocker that blocks pop-up advertising, an autofill feature that completes web forms with information saved on a users computer and customizable buttons that let users search their favorite web sites and stay updated on their favorite feeds.
Picasa. Picasa is a free service that allows users to view, manage and share their photos. Picasa enables users to import, organize and edit their photos, and upload them to Picasa Web Albums where the photos can be shared with others on the internet.