This little gem is an invaluable tool for any web developer. "The Microsoft Internet Explorer Developer Toolbar provides a variety of tools for quickly creating, understanding, and troubleshooting Web pages." Here's a list of the features from the download page:
-- 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 and measure objects on your pages.
I've been using it since beta 1 and it's definitely a productivity booster. There is a nice little feature not listed on the download page for those of you whom 508 compliance is a concern. Have a look at the 508 option under the Validate menu.
Update: Another helpful URL, thanks to Blake is this one from Channel9
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