Here's my first plugin for Habari.
Magic Tags allows you to use tags to help with formatting and organization. Any tag begining with "@" is not displayed in $post->tags_out. This allows you, for example to tag "asides" with "@aside" and set that up to display in a different format, without having an "asides" tag for the site.

The plugin also includes a function for displaying all of the tags used on the site, similarly filtered.

UPDATE:

I've updated the site tags list to display the number of posts for each tag, and sort by that number. It also hides any tags that have a post count of zero. Download is in the same place.

Download it here

Yet another reason to love Open Source! I adapted the Lifestream plugin by Chris J Davis and Drunken Monkey Labs, to create my links page. I give it the URL for the feed for sites I link to, and it retrieves the most recent post for each of them. It's, at best, a beta version, because of my "brute force coding" style. I really don't understand exactly how everything works. But it does work!

You can download it here. A quick note, the theme linkstream.php file will probably need some adjustments to look decent in another theme.