AS Crewella said, Up until the end of January, our record for the number of guests online was 241. We normally run around 70 guests in a given hour. The 241 wasn't real guests, it was due to a flood of search engine robots analyzing the site. The forum is set up to allow robots to search the site because we want all the search engine visibility we can get.

Last month we had a really big flood . . . 629 guests! Well, google is smart enough to know the visitors aren't real, it reports we had pretty much the same activity of live people that day, but the server software doesn't know the difference. So, now we have a new record showing . . .

But on the other hand, we seem to have had a continuing higher than average flow of actual visitors. Not in the 600+ level, but in the 80-100 level, along with some more member activity as well . . . The odd thing is, when I checked the logs, a higher than average amount of the traffic seems to be coming from the UK . . .
The DBPA is influenced by the number of guests visiting, the number of members spending time here, as well as the number of posts and topics.
So, in the end, the big spike was due to a surge in search engine activity, but it seemed to coincide with an actual increase in user activity.