Check out the following WordPress plug-ins.
1. Tweet Blender
2. Flickr+ High Slide
3. WP-DBManager
4. WP-Posts Ratings
5. YARPP – Yet Another Related Post Plug-in
6. Google XML SiteMap
7. SEO Friend Images
8. Theme Switch
9. Stats Press Reloaded
10. Contact Form
11. Cute Profiles