20100509: DnD.
You tell Ysadri: What email addy do you use for google docs?
You tell Ysadri: I'll share you the house rules
Ysadri tells you: My usual.  [wellknownkeyword]@gmail.com
Ysadri tells you: [wellknownkeyword]@yahoo.com is my 'normal' email.  
You tell Gudrun: You're not normal, so I shared it with the gmail
Secretly, Gudrun grins