Gadgets support, Google Notebook, Firefox 3 support, Settings Syncronization, Bookmarks...
New in v3.x: Support for Gadgets, Google Notebook feature (clip text, images, and links to the Toolbar's Notebook), improved AutoFill (with support for multiple profiles), ability to synchronize your settings (save your custom buttons, AutoFill profiles (except your credit card), and Toolbar preferences to your Google Account); Release Notes - Last Updated: 09.29.08 (v5.0.20080919W Beta)
Upgrade Meter:3
New in v3.x: Support for Mozilla Firefox 3.0, custom buttons, Bookmarks (accessible from any computer), Google Account Sign-in directly from the toolbar, SendTo button (share web pages via email, text message, or blog); Release Notes - Last Updated: 06.18.08 (v3.1.20080605W)
Upgrade Meter:3
New in v2.1.x:
Support for the new 2.0 Beta 1 release of Mozilla Firefox; Release Notes - Last Updated: 07.24.06 (v2.1.20060713W)
Upgrade Meter:4
New in v2.0.x:
Enhanced Search Box (search smarter with instant suggestions, spelling corrections, and history as you type), Safe Browsing (get warnings about web pages that may be unsafe); Release Notes - Last Updated: 06.23.06 (v2.0.20060606W)
Upgrade Meter:3
New in v1.0:
Google Suggest (get query suggestions as you type in the search box), SpellCheck (checks your spelling whenever you type in Web forms), WordTranslator (translates English words into other languages), and AutoLink (Turns US street addresses into links to online maps); Release Notes - Last Updated: 11.28.05 (v1.0.20051104)
Upgrade Meter:5
Pros: Quick access to Google, Froogle, and similar Google-related search sites; solid ad pop-up blocking capabilities (in IE version only), extensive customization options
Cons: Requires IE 5.5+ or Mozilla Firefox 1.0+ (no versions available for other browsers), AutoFill form fill tool only works for a single user (as opposed to MSN's toolbar, which supports information for multiple users)