Shaddows - 5:51 pm on Jan 15, 2009 (gmt 0)

So WHOLE DOMAINS for a long, regular period (technical use of 'period', as in 'fixed interval').

Are they getting dropped a long way?

Are they getting exchanged for another site (as opposed to Yo-Yo-ing agains a backdrop of stable-ish SERPs)?

Was there a lot of activity below the top three (possibly getting G to re-assess the searcher-intent for a keyword phrase)?

I'm looking for new (or at least improved and defensible) theory since my last stab at an explanation [webmasterworld.com] was met with rapturous silence (apart from an encouraging critique from the afore-summoned whitenight)