My traffic usually takes a dip on Saturdays then further on Sundays. I think more people are just busy doing things besides being at a computer.
As for what networkandy said I did notice this past week an overall drop in my traffic and I do think it's due to the new algorithm. I think it was just an internet wide reset more or less as some Hubs I had ranked high dropped back a little,but are already climbing back up again.
Seems it may take awhile yet for the new algorithms to finish the weeding out and sorting everything again.