Yo lo tengo así:
User-agent: *
Disallow: /cgi-bin/
Disallow: /wp-admin/
Allow: /wp-content/uploads/
Disallow: /wp-content/plugins/
Disallow: /wp-content/themes/
Disallow: /wp-includes/
User-agent: Googlebot
Disallow: /*.php$
Disallow: /*.js$
Disallow: /*.inc$
Disallow: /*.css$
Disallow: /*.gz$
Disallow: /*.cgi$
User-agent: Googlebot-Image
Disallow:
Allow: /*
Sitemap:
http://www.AQUI-PONE-TU-WEB.com/sitemap.xml
Disallow: /?s=
Disallow: /search
Allow: /feed/$
Disallow: /feed
Disallow: /comments/feed
Disallow: /*/feed/$
Disallow: /*/feed/rss/$
Disallow: /*/trackback/$
Disallow: /*/*/feed/$
Disallow: /*/*/feed/rss/$
Disallow: /*/*/trackback/$
Disallow: /*/*/*/feed/$
Disallow: /*/*/*/feed/rss/$
Disallow: /*/*/*/trackback/$
User-agent: MSIECrawler
Disallow: /
User-agent: WebCopier
Disallow: /
User-agent: HTTrack
Disallow: /
User-agent: Microsoft.URL.Control
Disallow: /
User-agent: libwww
Disallow: /
User-agent: noxtrumbot
Crawl-delay: 50
User-agent: msnbot
Crawl-delay: 30
User-agent: Slurp
Crawl-delay: 10