I am co-program chair for CP-AI-OR 2008 to be held in May in Paris. This year, we decided to allow “short papers” primarily to encourage presentation of preliminary work or work that might have appeared in another outlet but would still be of interest to the CP-AI/OR community. If you aren’t familiar with CP-AI/OR, it is a small (roughly 100 person) conference that brings together people in constraint programming and operations research to discuss issues in common in the two field (I actually put constraint programming as part of operations research, but most constraint programmers don’t agree with me).
The deadline for short papers is February 15. You can check out more details at the conference web site.