Spiders which obey robots.txt though. All they're asking is that others do the same

# http://www.google.com/robots.txt
User-agent: *
Disallow: /search
Disallow: /groups
Disallow: /images
Disallow: /catalogs
Disallow: /catalog_list
Disallow: /news
Disallow: /pagead/
Disallow: /relpage/
Disallow: /imgres
Disallow: /keyword/
Disallow: /u/
Disallow: /univ/
Disallow: /cobrand
Disallow: /custom
Disallow: /advanced_group_search
Disallow: /advanced_search
Disallow: /googlesite
Disallow: /preferences
Disallow: /setprefs
Disallow: /swr
Disallow: /url
Disallow: /wml
Disallow: /hws
Disallow: /bsd?
Disallow: /linux?
Disallow: /mac?
Disallow: /microsoft?
Disallow: /unclesam?
Disallow: /answers/search?q=
Disallow: /local
Disallow: /froogle?
Disallow: /froogle_
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Belden