A lightweight, easy-to-use jQuery plugin for fluid width video embeds.

Retweetie is a SIMBL plugin for Mac that makes Tweetie use Twitter's native retweeting functionality. No longer do you get a "RT @user: " tweet, but instead a real retweet. Just Repost your tweet as usual and let ReTweetie handle the rest.

Roundabout is a jQuery plugin that converts a structure of static HTML elements into a highly customizable turntable-like interactive area. (And now, not just turntables, but many shapes!)

This plugin aims to progressively enhance your page. Your navigation/pagination elements should be present in the HTML for non-js users, but the plugin will utilize those links to build out a more rich browsing experience.

Plugin for Coda which gives you a live preview ala Dreamweaver, etc. Looks handy.

This plugin allows you to have global archive and single page per post styles. Still in beta.

CSSExtra is a plugin for Coda that gives you access to some dynamic css

RSS Stream displays your social feeds in a lifestream way.

Perian is a free, open source QuickTime component that adds native support for many popular video formats.

Lithoglyph’s Mondrianum is a powerful plug-in that enables Mac applications to leverage the resources of the kuler community.

Seoquake is a powerful, Mozilla Firefox and Internet Explorer compatible, tool aimed at helping web masters who deal with search engine optimization and internet promotion of web sites.

If you've used the performancing plugin for firefox to post to your blog and are now annoyed by the Scribe Fire link on all your posts. Deepest Sender is a nice replacement.