What I like about this plugin listing over the standard jQuery one is the images. Nice to get a quick look at what the plugin will do. Hopefully the site will be actively maintained.

Link:
http://www.jqueryplugins.com/

Check out these posts too:

  1. Masked Input plugin for jQuery
  2. jCryption a javascript HTML-Form encryption plugin
  3. jQuery API
  4. Even more jQuery plugins
  5. Even more jQuery samples
  6. Create a one-time popup using jQuery
  7. Easy Drag and Drop with jQuery