Hey there! I just released a brand new WordPress plugin called Twitter Embed. It supports several ways of embedding tweets into your WordPress posts and pages. The new (new-new) Twitter interface has introduced a new link on tweets called “Embed this Tweet” which allows embedding through HTML code, shortcode or link.
This plugin implements all of those ways. It will even reverse an embed HTML into a shortcode if the user doesn’t have privileges to post unfiltered HTML. It caches the API responses from Twitter.com for better performance and well, it’s as simple as it looks and sounds, doesn’t require any configuration and works out of the box, right after activation.
Download it from the WordPress.org Plugins Directory, give it a spin and let me know if it works for you. Cheers and Happy New Year!