getyourwordsout also requires a monthly check-in, but the words don't have to have been posted as long as they've been written. I write in MS word which allows me to find out how many words I've written on each project and I keep track of them in my diary.

I have such a backlog of stuff to be posted, but a lot is waiting to be edited. I post things directly to some challenges in time for the deadlines, but then edit and expand the ideas at a later date before putting them up on my journal. Still means I can post two or three every day with no problem!