Auto Post Thumbnail
Automatically generate the Post Thumbnail (Featured Thumbnail) from the first image in post (or any custom post type) only if Post Thumbnail is not set manually.
WP DB Backup
Google Analytics for WordPress Yoast
W3 Total Cache
WordPress SEO Yoast
WP Facebook Open Graph protocol
This link has MOre usefull plugins if your needs match : http://www.labnol.org/software/must-have-wordpress-plugins/14034/