fishfinger - 3:46 pm on Sep 7, 2006 (gmt 0)

Interesting that it's happening to US sites as well.

Of the 14 sites out of 65 I manage that were affected (3 .nets and 11 .coms), 8 are now back.

Some of these I had worked on (links, new content, tweaks), some I hadn't. I think it's just a matter of time.

It looks to me as if Google is trying out some kind of filter

I think so. I recommend pointing out all instances to Google via the 'dissatisfied - help us improve' links after running your 'site:' search