Yahoo! Publisher Network will be unavailable on Friday, August 14th, for approximately 24-48 hours while we launch some enhancements to the systems. We apologize for any inconvenience, and thank you for your patience and understanding as we continue to work to improve the Yahoo! Publisher Network. I don't think the month is correct, August 14th a Monday. April and July have a Friday the 14th, but it seem odd they would give such advance notice.