I lost it twice actually, the first time was when rebellion was released.  I couldn't remember the password or the username and I was on a different pc because the old one dropped dead.  When I got a hold of steam support, they pretty much told me I was screwed, so I made another one and bought rebellion.  Then second pc dropped dead, mostly because it was cheap and low grade, and that was 3 months after rebellion released.  Now I just got a new pc about a week ago (a damn good one so no dead dropping), and I can't find where I wrote all the steam info down.  So I made a new account and I already have a few games from it.