I'll run a weekly contest on VOC. This contest will consist of 5 problems from UVa and 5 problems from SPOJ. All the selected problems will not be solved by anyone of the registrants. So the registration for this contest will be closed 5 minutes before the start time.
The contest time will be 2011-10-29 15:00:00 UTC, you can check the start time in your time zone here, and you can register for the contest here.