Indexed Page counts are dropping for many sites? whats going on?

ive seen sites drop hundreds of thousands of pages in the pass few weeks...

anyone know why index page counts are going down? is google getting strict on the amount of indexed content any one site can have?

I'm seeing it go on on these primariliy (for many sites)
66.102.11.99
66.102.9.99
66.102.9.104
66.102.11.104

just talked to someone on Search engine watch and for the past few weeks been monitoring multiple sites ...

anyone been hit recently? by this..

ill go ahead and name this since it seems to either be a new update or jagger related but deserves a new name :) ... Update Hiroshima