oh, i was hoping the dance was still on, mine has settled back to where it was 2 or 3 months ago. Interestingly there is one site that ranks above mine and it is nothing but an empty blog. It has some age and links but no content. Shows how little new content has to do with serps then as mine is updated every week day with new fresh content.
I think it's the influx of new sites being ingested. There were a few sites that jumped ahead I noted in some searches related to our site and on a few unrelated. Today when I went looking they've moved. I think when something new pops up it takes Google a day to digest it.