What online group allows users to create private channels?

What is a good JavaScript toolkit or snippet that allows a user to create a list of items to submit via a form?

• What would be a good JavaScript code library (or snippet) for creating a clean interface which would allow a user to create a list of items to submit from a form? For example, say I wanted to allow a user of my web application to add an arbitrary number of other users to a group. Are there any good libraries or JavaScript code snippets out there that would provide a good UI for doing something like that? I am definitely capable of building this myself, I was just wondering if there was already something out there that does this so I don't have to reinvent the wheel.

• Answer:

  You may want to use a <select> element which allows the user to select multiple values. Chosen (a jQuery/Prototype plugin) makes it easy and user friendly: http://harvesthq.github.com/chosen/ (look at the “Multiple Select” example)