faebu

With the Thickbox Announcement you easily can set-up an announcement, which will be displayed in a thickbox (lightbox). 
Several options let you control the apperenace and the frequency of the announcement. You can display any external 
content using an iframe or an inline content which can be edited using the standard wordpress editor.
<h4>Update Information</h4>
I’ve renamed my plugin since the plugin named looked very irritating. Since Version 1.0.3 the plugin is simply called Thickbox Announcement. 
If you are still using Version 1.0.2 no updates are displayed in the plugin overview of your wp installation. To perform an update 
you have to use the function Add New and search for this plugin. Click on Update to perform the automatic update.

Thickbox Announcement

With the Thickbox Announcement plugin you easily can set-up an announcement, which will be displayed in a thickbox (lightbox).

bseddon

The standard WordPress Thickbox can size images dynamically to fit the user’s browser window. But what about video or other types of media. 
This plugin allows any content to be shown in a thickbox that is sized dynamically to fit the browsers window. While a popup can be initiated 
from a link like the standard Thickbox, the plugin is intended to be used as a shortcode because more options to control the display can be supported. 
A shortcode builder form is provided so you don’t need to remember all options can get the names right.
<h4>Features</h4>
Dynamically sized content
<ul>
<li>Images, videos and even HTML pages can be dynamically sized to fit the user’s browser window</li>
<li>Optionally setup discrete sizes to show your content if it is seen best at specific resolutions</li>
</ul>
Uses the HTML5 tag to display videos
<ul>
<li>Specify urls to different video formats so more browsers will be able to see your videos</li>
<li>Falls back to FlowPlayer if a browser does not support the video tag or cannot display the formats you provide</li>
</ul>
Includes a shortcode builder
<ul>
<li>No need to remember all the options available</li>
<li>Fill in the blanks and the shortcode is created ready to paste into posts and pages</li>
</ul>
No conflict with Thickbox
The plugin does not use or rely upon the standard Thickbox implementation. Use both if that meets your needs.
See examples of the plugin being used
<a href="https://youtu.be/oUJ_hN0uIv8" title="How-to" rel="nofollow ugc">How-to video</a> showing and explaining the options available to create a shortcode
<a href="https://youtu.be/x-Pcf0hISbs" title="Example video" rel="nofollow ugc">Example video</a> to see some of the features being used.
<a href="http://www.wproute.com/responsive-thickbox/" title="Demo" rel="nofollow ugc">Demo</a> Visit our site to use an example

Responsive Thickbox

Display content for any media type in a thickbox that dynamically sizes the media to match the browser window.

Thickbox Announcement vs Responsive Thickbox