JQuery Plugin List

jQuery UI:
http://jqueryui.com/demos/

jQuery Ribbon
http://dev.mikaelsoderstrom.se/scripts/jquery/ribbon/
http://jqueryribbon.codeplex.com/

jCarousel:
http://sorgalla.com/projects/jcarousel/

Lightbox:
http://www.balupton.com/sandbox/jquery_lightbox_bal/demo/
http://plugins.jquery.com/project/jquerylightbox_bal

Facebox:
http://famspam.com/facebox

BlockUI
http://malsup.com/jquery/block/

ThickBox
http://jquery.com/demo/thickbox/

tablesorter
http://demos.flesler.com/jquery/scrollTo/
http://flesler.blogspot.com/2007/10/jqueryscrollto.html

AutoComplete
http://jquery.bassistance.de/autocomplete/demo/
http://bassistance.de/jquery-plugins/jquery-plugin-autocomplete/

Facebook style autocomplete
http://web2ajax.fr/examples/facebook_searchengine/

Accordion
http://jquery.bassistance.de/accordion/demo/

TreeView
http://jquery.bassistance.de/treeview/demo/

InnerFade
http://medienfreunde.com/lab/innerfade/

Tooltip
http://jquery.bassistance.de/tooltip/demo/
http://bassistance.de/jquery-plugins/jquery-plugin-tooltip/

Cycle
http://www.malsup.com/jquery/cycle/

Menu
http://be.twixt.us/jquery/suckerFish.php

Validation
http://jquery.bassistance.de/validate/demo/
http://bassistance.de/jquery-plugins/jquery-plugin-validation/

Pagination
http://d-scribe.de/webtools/jquery-pagination/demo/demo_options.htm
http://plugins.jquery.com/project/pagination


Sites containing plugin list:
http://www.open-open.com/ajax/2_jQuery.htm