What variables are available for email text?

I know %name and %site are, because they're used in the default setup of Forward. Any others?

In admin>settings>users, a little list of the available variables appears below the block to allow an admin to customize the email welcome message sent to newly registered users.

I'd like to use the username variable, to encourage people to visit the profile page of the person that emailed them a story.

Thanks for such a nifty moduleI I think the community on my site is going to use this feature a lot.