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What is the mu-plugins folder? – WPMU Tutorials
Users of WordPressMU have long been aware of a folder within wp-content called mu-plugins. Obvious conclusions were drawn because of the name and where it was, but this actually stands for “must-use” plugins. Why? Because any code (plugin) placed in the folder is run automagically, as if it [...]

WordPress 3.0: Multisite Domain Mapping Tutorial » Otto on WordPress
WordPress introduced great multisite features that were previously available to WordPress MU users only. Here is a good tutorial on how to use your own Top-Level-Domains within one WordPress installation.

Introducing Retweet Anywhere for WordPress
A great plugin for all twitter lovers out there, and for all people using social bookmarks on their websites. Indeed, you can now tweet directly from your blog, and your users can tweet using the twitter application you’ve created! Make sure you try it out!

Shortlinks with WordPress 3.0 – Optional, HTML, [...]

Front-end Editor | scribu
A great frontend editor plugin