It’s been a while since I had time to post some useful information here, meanwhile so you don’t turn into zombies or even worse get attacked by them here is some helpfull code from Google themselves:
http://www.google.com/robots.txt
And, just in case they change the file, here are the top lines from their robots.txt:
User-agent: zombies Disallow: /brains User-agent: * Allow: /searchhistory/ Disallow: /news?output=xhtml& Allow: /news?output=xhtml Disallow: /search ...