Theme your wordpress blog.
http://wordpress.org/extend/themes/
http://www.dailyblogtips.com/10-professional-looking-wordpress-themes/

Google "wordpress templates"

Let your blog readers share their favourite articles on digg or del.icio.us
Add social bookmark links such as digg or del.icio.us to each blog entry
Download wp-notable

Google Sitemaps
Creates a Google compliant sitemap of your WordPress blog.
Download

Archives plugin
Super Archive
SRG Clean Archives
http://www.sonsofskadi.net/extended-live-archive/
Super Archives Plugin for WordPress

Latest articles
http://www.vindictivebastard.net/downloads/last-10-posts.txt

FeedBurner FeedSmith
http://www.feedburner.com/fb/a/help/wordpress_quickstart

Adsense on your blog
Adsense-Deluxe
- Support for AdSense ads and allows you to add ads to posts.

Related Posts
Link to related posts on your blog, which is based on the content of the post.
Download Related Posts

Google Analytics and Feedburner Reports plugin for WordPress
Download

Add to any feed reader
http://wp-plugins.net/plugin/mp_addtoany_fr/

Social bookmarking sites
Social bookmarking sites allow websurfers to save, catalog, and share interesting pages they find online. The Sociable plugin appends links for your readers to use those sites to the end of each of your blog