Someone hot-linking to some of your hi-res graphics?
I do have some hotlinking going on and that doesn't bother me too much. I've monitored that and it has minimal impact on my bandwidth.
But this spike is far too large to be explained by that. I jumped from an average of about 20K hits a day to 135K overnight and nothing in the logs seem to indicate a single source. Like I said, I'm stumped.
To get that kind of spike, I'd have to get linked by Drudge, Yahoo, or MSN. I just can't figure out where the spike came from.