Mike, hopefully it's just a temporary fluctuation for both of us. I've seen this with other sites, only to soon return back to normal several days later. (keeping my fingers crossed that this is the issue...to prevent myself from goin nuts)
I've also got a ton of 'nofollow' tags on, but see no reason why that solely would be the issue.
Welcome to the crib.
btw, watcha think so far about Halo Destiny ?