[development] subscribe to a node

[Moshe Weitzman]

> If we are encouraging people to edit each others module description (or 
> handbook pages for that matter), I would very much like to see an 
> opportunity to register for an e-mail upon change, very much like how it 
> works on Wikipedia. 

yeah sounds good. this is a development mailing list so i assume you are a 
developer. get to it!

the likely implementation is add 'subscribe to this node' feature to core. 
any less implementation (like a contrib module) is not likely to used on 
drupal.org

-moshe