Auto-Scroller makes it possible to scroll the posts easily and rapidly, with a click.
Intelligent Content Ad Insertion lets you insert advertisements in post, page and feed content without manual intervention.
Skin Tags allows a tag to break across the column, creating a more del.icio.us-style tag cloud.
TechTags adds a single line to a post or page to display Technorati tags.
WP-Offline lets your readers cache your entire blog for offline reading using Google Gears.