Integrated Google Notebook. In order to use it, you no longer need to put a separate extension.
Synchronization of toolbar settings between browsers, including the toolbar under Internet Explorer.
Custom buttons (custom buttons) can now contain gadgets similar to iGoogle gadgets.
Redesigned and supplemented bookmarks. Now when creating a bookmark, you can select a part of the text on the page, and the next time it is entered it will be highlighted.
LinkDoctor. Corrects some URLs typed with an error.
WebHistory. The history of the pages you visited is saved. It became possible to search all the pages visited.
Many other features were somehow improved. Many bugs fixed. (Contributed probably more. :)
Not without patriotic pride I want to note that this version of the toolbar is the first, almost all of the development of which was carried out in the St. Petersburg office of Google. Apart from minor updates of the 3rd version, this is the first real release for the team.