Имеем такой robots.txt для wordpress, индексирует отлично:

User-agent: *
Allow: /wp-content/uploads
Disallow: /wp-login.php
Disallow: /wp-register.php
Disallow: /cgi-bin/
Disallow: /wp-admin/
Disallow: /trackback
Disallow: */trackback
Disallow: */*/trackback
Disallow: */*/feed
Disallow: */feed
Disallow: /*?*
Disallow: /comment-page-*
Disallow: /*/?replytocom=*
Disallow: /tag
Disallow: /category/
Disallow: /author/
Disallow: /20*/*
Disallow: /page/*

User-agent: Yandex
Allow: /wp-content/uploads
Disallow: /wp-login.php
Disallow: /wp-register.php
Disallow: /cgi-bin/
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /wp-content/
Disallow: /trackback
Disallow: */trackback
Disallow: */*/trackback
Disallow: */*/feed
Disallow: /*?*
Disallow: */feed
Disallow: /comment-page-*
Disallow: /*/?replytocom=*
Disallow: /tag
Disallow: /category/
Disallow: /author/
Disallow: /js/
Disallow: /20*/*
Disallow: /page/*
Host: www.famreal.com

User-agent: Googlebot-Image
Allow: /wp-content/uploads/

User-agent: YandexImages
Allow: /wp-content/uploads/

Sitemap: www.famreal.com/sitemap.xml