They probably open after Camp 2007 has ended, around September/October time. I don't think I'll be able to do it this year because I applied to late but I'll definitely be applying for next year as I think it's possible to do during my uni holidays. Also, if you're worried about your application then why not get some experience working with children now, over the summer holidays. Seems like the perfect time to me. Volunteer with an after school or summer holiday club or something.