http://www.delphifaq.com/faq/web_publishing/f760.shtml said:; block Google's image crawler completely
User-agent: Googlebot-Image
Disallow: /
; block all spiders and bots from those 2 directories
User-agent: *
Disallow: /cgi-bin/
Disallow: /pictures/
; allow Googlebot to access everything except /cgi-bin
; and all other bots can access nothing
; finally allow ia_archive (alexa.com) to access everything!
User-agent: *
Disallow: /
User-agent: Googlebot
Disallow: /cgi-bin/
User-agent: ia_archiver
Allow: /
User-agent: *
Disallow: /
User-agent: *
Disallow: /cgi-bin/
Disallow: /tmp/
Disallow: source.php