passwordless sudo

[Hiisi]

Hi, list!
I'm trying to set up passwordless sudo for myself. It's a shiny brand
new fresh-installed F16. During first boot I had been asked to create
a new user and put him to administrative group. I answered yes and
hence my user is able to run commands using sudo. However in
/etc/sudoers there's not a mention of my user. I've added the
following string to it:
hiisi   ALL=(ALL)       NOPASSWD: ALL
Apparently it has no effect - I have to enter password each time sudo
is invoked for the first time.
What the heck and how do I solve this mystery?
-- 
Hiisi.
Registered Linux User #487982. Be counted at: http://counter.li.org/
--
Spandex is a privilege, not a right.