Brendon Boshell

Stumble! for WordPress extends WordPress to support a “random article” feature, similar to <a href="http://www.stumbleupon.com/stumblethru.php" rel="nofollow ugc">StumbleUpon’s StumbleThru</a> and Wikipedia’s (Mediawiki’s) random article feature.
It has shown that it can significantly increase pageviews on a blog.
The plugin supports basic “go to any random page” functionality, but can also integrate with <a href="http://mitcho.com/code/yarpp/" rel="nofollow ugc">Yet Another Related Posts Plugin</a> to stumble similar articles. Stumble! for WordPress will automatically (optional) give priority to articles with more comments, so users will be brought to your most popular posts.
Since version 0.2, the plugin also shows statistics to show total number of stumbles, and hits to individual articles as a result of Stumble! for WordPress.
New for version 1.0: You can now enter the Stumble! for WordPress network (from the options panel) which will send your traffic from stumbles from other blogs! (and visa-versa)

Stumble! for WordPress

Stumble! for WordPress extends WordPress to support a "random article" feature, similar to StumbleUpon's StumbleThru.

Automattic

Daniel Bachhuber

A quick and easy way to see post meta associated with any given post. When activated, this plugin prints your post meta keys and values inside of a post meta box.
Originally developed for <a href="http://vip.wordpress.com/" rel="nofollow ugc">WordPress.com VIP</a>-hosted clients, we thought it would be useful for development environments, etc. too. Feel free to <a href="https://github.com/Automattic/Post-Meta-Inspector" rel="nofollow ugc">fork the plugin in Github</a> and pull requests are always welcome. Hit us with feedback, questions, bug reports, and feature requests in the forums.

Post Meta Inspector

Lovely little tool. Saves having to go into the database and look through the postmeta table when debugging. Thanks!

Stumble! for WordPress vs Post Meta Inspector