Sphinn announced they are closing the site to submissions from 5:00 pm PT on December 31st through about 9:00 am PT on Monday, January 4th.
Matt McGee, the Sphinn Editor, explained the reason for them taking down the submissions capability:
Over the Christmas weekend, we found that just about the only things being submitted to Sphinn were spam. Since we're expecting the New Year's weekend to be similar, we've decided to just turn the submission form off for a few days.
Also, it means - just relax - enjoy the down time and rest up for an awesome 2010! Easier said then done, eh?
Forum discussion at Sphinn.