How often do you weigh yourself?

Every day, once a week, or some other frequency?  And why?

Its proven that if you weight yourself once everyday at the same time you'll lose more weight because you'll be monitoring youself better. 

 

I do every morning when I get up.

I weigh myself most days when I get up so that any increase can be nipped in the bud, but I consider Sunday my 'official' weigh day to figure the difference from the previous week.