Ajax is cool, but it won’t gain much mindshare, apart from early adopters, if it doesn’t offer a decent toolset. Here’s the contents of my tool bag. It’s not much but it’s a start.
- Firefox (of course).
- Venkman, the Mozilla Javascript debugger (see here for making it work with Firefox).
- Mozilla Web Developer Extension by Chris Pederick.
- The amazing Mouseover DOM Inspector.
- And the latest addition: a Greasemonkey script for tracing XMLHttpRequest calls.


The Javascript shell bookmarklet is quite useful too.
Try http://www.modernmethod.com/sajax/
According to their website,
Sajax is an open source tool to make programming websites using the Ajax framework — also known as XMLHTTPRequest or remote scripting — as easy as possible. Sajax makes it easy to call PHP, Perl or Python functions from your webpages via JavaScript without performing a browser refresh.