I’ve used the Pixelated wordpress theme and added the suckerfish css drop down menu for wordpress  in this site.  After commenting out the wordpress nav bar in the header.php file, I pasted in the suckerfish menu instead, I then disabled the style sheet that came with the menu in the menu options so that the drop down menu navigation bar in this site uses the pixelated theme. Here’s a list of some other plugins for wordpress that I’ve found useful…

Add to Any: Share/Save/Bookmark Button
All in One SEO Pack
Audio Player
Contact Form 7
Countdown Timer

Google Analytics for WordPress
Google XML Sitemaps
Google Integration Toolkit

LinkWithin – Related Posts Widget with Photo Thumbnails

Login Logger

Multi-level Navigation Plugin
NextGEN Gallery
Ozh’ Admin Drop Down Menu

Really Simple CAPTCHA
Search Meter
Smart Youtube
Subscribe 2 (email a list of subscribers when a new post is published)

Twitter Tools
Twitter Tools – Bit.ly URLs
Twitter Tools – Exclude Category
Twitter Tools – Hashtags

WordPress Gravatars

WP-Polls