Greek

This plugin takes an XML feed from http://www.zhubert.com and allows you to insert verses from the New Testament, in Greek, into your blog. The feed contains lots of additional grammatical information that can also be displayed. See here for details.

Wayback

Wayback adds the function
cg_wayback ( $start_ago, $end_ago )
The output of the function is an unnumbered list of blog entries posted between start_ago and end_ago days ago. Default is 368 and 362, giving a one week period one year ago.

For instance, on Jeyanth's Blog the sidebar contains the following code:

<li><h2><?php _e('This Week Last Year'); ?></h2>
<?php cg_wayback(); ?>
</li>

Sourcecode here. Rename it to cg_wayback.php and drop it in your plugins folder. Activate it from your administration console and the function is there for you.