Google Friend Connect plug-in for Drupal
http://code.google.com/p/drupal-friendconnect/
Autotab: jQuery auto-tabbing and filter plugin
http://www.lousyllama.com/sandbox/jquery-autotab
Spacegallery - jQuery plugin
http://eyecon.ro/spacegallery/
Ben "Cowboy" Alman's jQuery Plugins
http://benalman.com/archives/projects/
Rik Lomas' jQuery Plugins
http://rikrikrik.com/jquery/
jQuery ListNav Plugin - Letter-based navigation
http://www.ihwy.com/Labs/jquery-listnav-plugin.aspx
jQuery s3Slider Plugin
http://www.serie3.info/s3slider/demonstration.html
Brandon Aaron's jQuery Plugins
http://brandonaaron.net/code
jParallax - jQuery Viewport plugin
http://webdev.stephband.info/parallax.html
Firefox Bandwidth Throttling Plug-in
https://addons.mozilla.org/en-US/firefox/addon/5917