Lowkei - 7:25 am on Dec 1, 2008 (gmt 0)

Agree with tedster.

My experience is that i have temporary closed down my site by uploading a "site is no longer available" index page and as soon as new cache is collected, all my ranking gone.

After I re-open the site (contents and links unchanged at all), the ranking come back (i'm not sure whether it's exactly same ranks or not but it's roughly same, at most 1 or 2 positions differ)