Of all the tags in ColdFusion, CFDUMP
has to be one of the handiest tags. Any ColdFusion developer who uses the tag has probably at some point wanted to use it in other languages.
Well thanks to Brian Love for pointing me to this handy javascript dump script (link no longer works), it's output is even inspired by ColdFusion's CFDUMP tag.

This will be very handy for working with JSON!
You should also checkout FireBug for debugging in JavaScript, I have been using it for a few weeks now, and it is rocking!
See Ben Forta's: Dumping Flex Objects, and dbug for php.
Comments
I have been using it for about 2 months now and it is just a fantastic tool to have!
Wow, this one has been flying under the radar for a while... Nice find though! I wonder how long before FireBug has something like this too :)
Hey Pete, awesome find man! I posted about it in my blog and linked back to your article.
Thanks for the reference, hope you find this tool as useful as I have!
Oh, and I should add reigdrang your comment on FusionDebug that indeed the 2.0 version mad significant improvements in the install process. It also includes the option now to either install as a plug-in on top of an existing Eclipse setup, or to install a complete new one with both FusionDebug and CFeclipse (for now, not the CF8 extensions).