Official start date will be 22 January, official end date 2 February, since I'm doing this by a standard work-week and only planning to do 10 days, not 2 solid weeks.
The rules, such as they are, are to set yourself a goal, be it daily or weekly or page count or however you want to do it, to achieve over this two week period of time. People have set 2500 word goals, 5 page goals, 20 page a week goals: it's all good. The idea is to have an environment that encourages you and provides a little competition for a couple of weeks.
My initial thought was to do 20 pages a day, but I think I'm going to modify that a bit: my goal will be one chapter a day (more like 15 pages than 20) and if I push on through to 20 a day I'll do the dance of triumph every evening.
I suspect, if this goes at all well, that I'll probably run these two-week bursts once a month. A bunch of people've said, "Gosh, at any other time I'd love to participate," so with any luck I'll be running challenges in time frames that people will be able to work into their schedules. I expect I'll be running them around what works for *me* (ie, around cons and edits and rewrites and etc), so they're unlikely to all work for everybody, but hopefully each one will work for at least a few people. :)
Looking forward to this! :)