Internet Explorer Developers Toolbar

With the IE Dev Toolbar you have several features at your fingertips to go deep into existing pages or pages that you are currently creating. You will be able to explore the DOM tree and find elements on the page, disable IE settings, view information, outline elements, control images, resize pages to common screen resolutions and have a powerful ruler that lets you measure pixel perfect content on your page.

The toolbar can be downloaded here:
http://www.microsoft.com/downloads/details.aspx?FamilyID=e59c3964-672d-4511-bb3e-2d5e1db91038&displaylang=en

Support can be found here:
http://channel9.msdn.com/wiki/default.aspx/Channel9.InternetExplorerDevToolbar

Here is the official list of features.

Overview

The Internet Explorer Developer Toolbar provides several features for exploring and understanding Web pages. These features enable you to:

-- Explore and modify the document object model (DOM) of a Web page.
-- Locate and select specific elements on a Web page through a variety of techniques.
-- Selectively disable Internet Explorer settings.
-- View HTML object class names, ID's, and details such as link paths, tab index values, and access keys.
-- Outline tables, table cells, images, or selected tags.
-- Validate HTML, CSS, WAI, and RSS Web feed links.
-- Display image dimensions, file sizes, path information, and alternate (ALT) text.
-- Immediately resize the browser window to a new resolution.
-- Selectively clear the browser cache and saved cookies. Choose from all objects or those associated with a given domain.
-- Choose direct links to W3C specification references, the Internet Explorer team weblog (blog), and other resources.
-- Display a fully featured design ruler to help accurately align objects on your pages.


The Developer Toolbar can be pinned to the Internet Explorer browser window or floated separately.

This version of the Developer Toolbar is an updated version of Beta 1; it was updated on October 31, 2005. Several issues are resolved and some feedback has been incorporated.

-- Element bounding box calculations are more accurate.
-- Outlining of elements is now significantly faster.
-- The image report no longer crashes.
-- Installation no longer requires a reboot. (Beta 1 users will still be prompted to reboot because the current installer invokes the original uninstaller).
-- The minimize and maximize buttons now refresh after the "Resize" command.
-- The "Select element by click" bounding box is now more visible on pages with blue backgrounds.
-- The attributes editor (middle pane) now has variable width fields (for example, you can type beyond the width of the box).
-- Fixes for some pages that do not trigger OnDocumentComplete events.
-- Fixed the continuity of using "element" rather than "tag" in the menus.
-- The ruler is easier to use and to scroll.
-- Enabling/disabling images no longer restarts Internet Explorer.
-- The Resize menu now contains more resolutions.
-- Editing a property is now much less likely to let keystrokes "leak" back to IE and navigate without the user expecting it.
-- Trying to use the ruler while IE is in "folder mode" should no longer crash the browser.

New features and functionality have also been added.

-- Default styles (in the third pane) now appear in gray, separating them from explicit styles.
-- The ruler dialog is always populated with the ruler information if there is just one ruler.
-- The ruler dialog now describes advanced features.
-- "Undo all" reverts the page to the initial state.
-- You can now remove all outlines.