If you have a google apps account, and you create an account for a user (or adminstratively reset their password for them) they will get an email like:
Hi Tina,
You have a new account at Example Association.
Your username is tsmith. Your initial password is ZjAdhUVC
(you will need to change this when you log in).
Your new email address is tsmith@example.com
You can sign in to Example Association services at:
http://www.google.com/a/example.com
That's 'will need' not 'we ask nicely and you can ignore'. When you create a user, it gives the option of setting their password for them, or using a temporary password, which they have to change.
