Site protection plugin for dev instances to avoid indexing by search engines. Doesn't allow access to the site without being logged-in.

Autover plugin will automatically version your CSS and JS files in the generated html page (e.g. style.css?ver=1359464809).

Generate a mapping of image - article it belongs, by scanning all attachments.

Load one Theme for a specific user. You must set the theme from User Profile then logout and login again in order to take effect.

Convert all your database character sets to utf8, trying to follow Codex guides.