I'm working on getting a listing of common external web links to share with my team around the country.

What's a good tool or website that can accomplish this?
I've tried Delicious.com but it's not exactly what I'd like.

Here are some details:
- Show a full listing of the bookmarks/sites (like bookmarks within your browser)
- Easy ways to add categories (folders) under the main listing
- Ability to add or update the links/bookmarks by others

Thanks in advance!