Displays a popup window (css layer) above the fold that shows new posts and comments since your last visit. Managed with cookies.
<h3>News</h3>
Fixed compatibility with wordpress 2.3, which also breaks compatibility with 
anything earlier. For that refer to <a href="http://svn.wp-plugins.org/new-posts-popup/tags/0.2/" rel="nofollow ugc">version 
0.2</a> of this plugin.

New posts popup

Displays a popup window (css layer) above the fold that shows new posts and comments since your last visit. Managed with cookies.

aknieriem

The simplelightbox wordpress plugin brings the <a href="https://github.com/andreknieriem/simplelightbox" rel="nofollow ugc">simplelightbox</a> jquery plugin to wordpress.
You can change every option that the lightbox have in the admin panel under Design -> Simplelightbox.

Simplelightbox

Touch-friendly image lightbox for mobile and desktop without requiring jQuery

New posts popup vs Simplelightbox