There has been new activity on your Mt.Gox account.
A summary of your recent trade(s) is provided below.
I noticed this in my inbox today. I knew I don't have any orders placed and without thinking it through thought I was hacked despite my yubikey. I rushed to my mtgox account to see in fact no trades have been made and checking the email again it was a history of previous trades. I think the title of the message should be different MagicalTux
Maybe "Previous Week/Month Trade History"?