I just did a search on Google, clicked the first link in the SERPS, realized the result was junk and quickly bounced (using the BACK button).
When the SERPS reappeared, a (blue) link appeared below the title of the result I just clicked which read:
Block all www.example.com results
I then tried another link,this time quickly bouncing on purpose to see if the "Block all" link appeared -- it did.
... is this new ?