Cool plugin for Adium that requires people to answer a challenge question before their message is delivered to you (if they’re not already on your contact list). Should block most IM-Spam.
#plugin
Superfish
Suckerfish menu system implemented in jQuery
WP-Print
Plugin that provides an alternate/configurable version of your WP content for printing.
Login Logger
WordPress plugin that keeps track of login attempts and failures. Accessed via wp-admin.
Collaboration E-mails Plugin for WordPress MU
Collaboration E-mails Plugin for WordPress MU
Really cool work-flow management plugin for WP (and WPMU) that is best for multi-author blogs.
jParallax
“Parallax turns a selected element into a ‘window’, or viewport, and all its children into absolutely positioned layers that can be seen through the viewport.”
WP Calais Archive Tagger
Plugin that goes through your archives and uses a web service to automatically tag everything with semantically-rich tags.
Flash “Cumulus” Tag Cloud
Pretty cool, animated implementation of a tag cloud. Includes a WP plugin and details on how to generate your own from any data source.
WPCandy
WordPress Themes, Plugins, Tips, and Tricks
Essential WordPress plugins
“I’ve set up a lot of new WordPress sites lately, and I’ve come up with my own homebrew installation package. All but one of these are admin tools; I don’t have a standard list of theme additions because every site is so different.”