I think I was noticing the same thing... I haven't uploaded anything in the past few days, BUT the stats - at least in terms of visitors - doesn't seem to have been updated since 8/15. I at least seem to get a few visits to some of my photos from a webcrawler/search engine/etc every day. I figured it was a glitch of some sort or that the site was being updated and that was affecting the counts.
I was going to give it another day before getting too concerned. Perhaps Abbie will be able to enlighten us.
NB: Brian, I just found a thread from the past day or so where someone noticed the same thing. According to Abbie, it sounds like they're doing some recaching/upgrading of some coding and such so the counters are off. Hopefully they'll be back on soon.