unikat - 12:17 pm on May 18, 2012 (gmt 0)

I can also confirm that in my niche when adding -[a-z0-9].tld Google shows pre-Penguin results.
I've tried many combinations and all of them shows pre-Penguin results:

-site.com
-test.com
-#*$!.com | .fr | .co.uk | whatever tld