Yup, weekly for me... that is most of the time. Most people experience their most rapid weight loss during the first few weeks and daily weighing can be motivating as others have noted. As the loss starts to level out the day-to-day fluctuations can be discouraging as bongatforums said (I too can get discouraged with lack of progress and have been known to "spluge" on a "oh what the heck... not losing anyway" whim). At that point weekly seems to make more sense.
I agree with Michael and Frenchhen that owning your own scale that will allow you to weigh yourself at a same time of day would be a good idea.
2.5 years, 45 pounds later... 128ish pounds