OK, the set of tools I used this time (they deserve some plugging!):
Instant Source, from Blazing Tools (http://www.blazingtools.com). Great tool to look at the code in your browser: both the code that came from the server as the current state of the DOM. The “element under cursor” view is also very useful. 30 day full test version available for download.
VS.NET 2003 from Microsoft, great for debugging!!!
The power of client side code is overlooked by most programmers, especially in the current .Net era with ASP.NET server controls where programmers don't look at the resulting code thrown at the browser. All those postbacks... all those HUGE pages (OK, gzip compression solves a problem here, but is OFF by default in many browser configurations. IE sets it OFF by default within the intranet zone!). Would't it be great if web applications were written like Microsoft Outlook Web Access, the online “Outlook” client (great work!).