[siong1987]

There is the jQuery Plugin Registry (http://plugins.jquery.com/). There aren't many people using it tho.

There is also a really simple guideline to publish your plugin there: http://plugins.jquery.com/docs/publish/

Currently, there is no way to review which plugin is better. But at least it shows the number of watchers for each plugin, which can be an okay indicator whether a plugin is good or bad.

[michaelmior]

That is useful, but obviously only applies to jQuery plugins.