Perhaps the Paraprofessionalization of ARES/RACES will make the Radiogram a relic, but they are actually quite useful.
The wikipedia version gives a nice nickel tour of radiograms:
As you might expect the ARRL has info on it:
Another basic description of what it is:
Here is a link to blank forms:
Having the discipline and skilled practice to communicate & pass traffic in Radiogram standard format is a basic skill I hope we never loose.
Here are some more links Paul AE5JU sent me:
I dug these up:
This is a Powerpoint presentation, Getting Started With Traffic Handling:
This used to be in the old ARRL Net Operations manual that some DEC have (not sure of the exact title) [but appears to be] no longer in print. Now you can download it as pdf files.
You can also buy these “Message Pads” from ARRL.
Radiogram forms, print your own:
http://www.arrl.org/FandES/field/forms/radiogram2.pdf Printer friendly, less black.
The ARRL has just published an article reminding us on Radiograms: http://www.arrl.org/news/features/2009/11/24/11215/