Just stum­bled on a link of a link and found that there is too a “web devel­op­er tool­bar” for IE. Although (cur­rent­ly) unrat­ed, it seems to pro­vide some use­ful func­tion­al­i­ty:

• 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 800x600 or a cus­tom size.
• 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.

But, don’t go and down­load­ing all at once… after all it is still in beta—“Beta 2” to be exact.