Well, for those interested, here it is:

http://www.wow-ratings.com/MultiToons.zip

Note: This has been tested and found working with IE 8 and FireFox 3.6.8
It doesn't seem to work with Chrome due to limitations on XMLHttpRequest.

This tool consists of 2 parts:

A. The Addon
You will most probably have unzipped this file in the WoW/Interface/AddOns/MultiToons folder. Good move.
The MultiToons.lua and toc files should remain there, and next time you start WoW the addon should be automatically loaded.
To make sure, just type /multitoons while in-game and you should get an answer stating the version number. You can also check the loading chat at the start.

For you toons to be listed, you will need to log at least once on each of them. The Addon will automatically save all the necessary information (current XP, rested XP, Justice Points etc) in WoW/WTS/Account/<Account Name>/SavedVariables/MultiToons.lua file.

To make things easier to read, you can organise your toons in teams. For example, just log on a toon and type /multitoons AllStars to put it in the AllStars team.
To remove a toon from a team, just type /multitoons again.


B. The Web Page
This web page will display all the information gathered by the addon.
The easiest way to do so it to copy the MultiToons.htm file to the WoW folder. For security reasons there is no other way for a web page to see local content (online web pages cannot access local hard drive files)
If you have any security concerns, feel free to check the code in this file; it is all easily accessible, and even commented a bit. If you are paranoid, feel free not to use this at all! :-)

Once you copied the MultiToons.htm file to the WoW folder, open it in a text editor and scroll down to line 20 to 50.
Edit the Account information (no email or password or anything risky, just the name of the folder to look into for the mods SavedVariables.lua)
Save the file, and double-click it to load it in a browser. You will need to be online for the images to load correctly.
Alternatively you probably can type this url in your browser: C:\Program Files\World of Warcraft\MultiToons.htm

Once everything is working fine, if you wish to remove the instructions just edit the file and change the showHelp parameter to "false" :-)

If everything goes well, you should end up with something like this:
http://www.wow-ratings.com/images/multitoons-addon.jpg


I'd be very interested to see how it all looks for you guys, so please don't hesitate to post screenshots (or send them to webmaster@wow-ratings.com)

Feedback more than welcome (was it easy enough to install? do you see all the info you want? etc)
Thanks!
-Zub