Web Development Helper is an IE browser extension written by Nikhil Kothari who co-authored the Microsoft Press book "ASP.NET Server Controls and Components". It includes Page Information, DOM inspector, Capture Screenshot, script debugging, script console, script class browser, HTTP logging, and ASP.NET tools.
The script console allows you to execute script snippets or load a script and you can save the script to a file.
The ASP.NET tools are the biggest difference between this and other tools like the IE Developer Toolbar or the Firebug add-in for Firefox. The ASP.NET tools only work with Web Applications running in debug mode on localhost. The ASP.NET tools allow you to Show Viewstate, Show Trace Information, View Managed Cache, or Restart Application.