ellgee - You can weigh whenever you want as long as you have it posted by the deadline. So if you are weighing on Fridays, then this Fridays weight is the weight you will need to use for your post. And of course you can go ahead and post it as soon as you weigh, you don't have to wait until Monday.
I was just reading through the posts and Cakebatter just reminded me of something I was trying to forget. Remember how optimistic I was about what I would lose this week? I just remembered that TOM is going to hit me right on my weighin day.

I just hope that I've lost enough so that I can hide that stupid TOM bloat..........otherwise I'm going to be very upset!