I have enabled a few new Vanilla add-ons today:
Allows users to mark all discussions as viewed and mark category viewed. To mark all threads as viewed click on the gear under your user name and choose “Mark All Viewed”. You can also do this on a per category basis by hovering to the right of the category name until a gear appears.
Allow users to create and vote on polls.
Users may add tags to each discussion they create. Existing tags are shown in the sidebar for navigation by tag.