1. Google Doc Embedder
Google Doc Embedder lets you embed PDF files, PowerPoint presentations, and TIFF images in a web page using the Google Docs Viewer (no Flash or PDF browser plug-ins required).
2. Typad Anti Spam
Typad Anti Spam is a collaborative effort to make comment and trackback spam a non-issue and restore innocence to blogging, so you never have to worry about spam again.
3. WP-Flickr Plugin
This pugin will allow you to connect to your yahoo flickr account, flickr is an photo images gallery provided by yahoo for free acount you will have 100 mb storage capacity there after the plugin activated you can easily add the filckr images to your post or pages.
4. Search Engine Optimized Plugin
This plugin will optimized your blog post /page search setting, by using this setting your pages /post will be easier to searh on the common search engine like Google, yahoo, etc.
5. Event Calendar Plugin
This is actually a plugin to show calendar, and you can also added an event to it and show it on the sidebar using widget.
6. WP-Cumulus Plugin
Have you seen a widget that show tag or categories animated by flash ? if yes you can show it on your blog using this plugin.
7. WP-Polls Plugin
This plugin provide you a polling features for your blog, with this plugin you may ask your vistor to fill out pools that you created.
8. Yahoo Messenger Online Status Plugin
This pugin will added your yahoo messenger online status to your widget blog.
9. Add to Any: Share/Save/Bookmark Button Plugin
This pugin will Helps readers share, save, and bookmark your posts and pages using any service.
10. My Page Order Plugin
This pugin will make pages arrangement become more easier.
11. Author Avatars List
This pugin will show your avatr picture on your sidebar.
This Plugin enables user to upload and show your own avatar.
13. DM Albums
DM Albums is an inline photo album/gallery plugin that displays high quality images and thumbnails perfectly sized to your blog.
14. WordPress Mobile Edition
Turn your WordPress into a mobile website/blog automatically.
15. SI CAPTCHA Anti-Spam
Adds CAPTCHA anti-spam methods to WordPress on the comment form, registration form, login, or all. This prevents spam from automated bots.
16. Snow, balloons and more
This plugin enables snow falling down your wordpress blog.
17. Twitter Widget Pro
A widget that properly handles twitter feeds, including @username, #hashtag, and link parsing. It can even display profile images for the users.
18. Viper’s Video Quicktags
Easily embed videos from various video websites such as YouTube, DailyMotion, and Vimeo into your posts.
19. SSG WordPress Google Audio Player
A slim, simple mp3 player plugin for WordPress utilizing Google’s free Flash Audio Player.