The basic idea was this:
(1) Each week, the mod would put up a post that included a simple little graphic token.
(2) Members would reply to the post, stating their word count/writing goal for the week.
(3) At the end of the week, if you hit your writing goal, you could feel justified in claiming the week's token as a reward. (Of course, there were also posts during the week for members to talk about their progress, encourage each other, etc.)
It was quite low-pressure, but the personal accomplishment of "earning" those little tokens was a ridiculously helpful motivation to hit my declared word count each week. I loved it while it lasted... But unfortunately, about two months after I discovered project_finish, it suddenly and permanently went silent with no explanation. :Þ
Which is what brings me here (well, thanks to kalloway at onedeadplotbunny). There are reasons why I can't commit to running a community these days--but I would absolutely love to see someone else create one based on project_finish's model. I know it would help me now, the same way the original comm helped me then; and I think it would be great for others too.
(And while I'm here, might I also add that I'd be delighted if someone would create a multi-fandom genfic bingo? It's nearly impossible to find a bingo challenge that doesn't involve kinks or squicks of one kind or another.)