Here are some of the popular and not so popular Wordpress themes directories with short reviews.

http://wordpress.org/extend/themes/ : The official Wordpress.org themes section. Features search by number of columns, primary colour of the theme, theme topic, fixed or flexible width and some of the features like custom-colours, theme options, translation ready, buddypress and so on. Features most of the themes but misses out on some of the great free themes offered by commercial Wordpress theme developers. No information about the version of Wordpress the theme is developed for.

http://topwpthemes.com/ :  Features themes by category, number of columns, left or right sidebar and if widget ready or not. No search option. Great collection of themes.

http://wordpressthemesbase.com/ : Features themes by categories and features. Offers search feature and also top downloaded, rated and viewed.

http://www.themes2wp.com/ : Free and Premium themes. Found some very neat themes on this site. Check it out.

http://www.wpthemes360.com/ : Just thumbnails of many many themes. No search or any other feature.

and more other directories coming soon…

Related posts:

1. Wordpress Themes Demo Browsed through the countless Wordpress theme directories and got irritated clicking around. Check out the following sites and go straight to the theme demos....
2. Wordpress updates to 2.9 Wordpress updated to version 2.9...
3. Google Chrome browser debuts for Macintosh’s Finally, after a wait of nearly one year Google has released its web browser for Apple Mac's. Google Chrome is mostly popular as a fast start-up and fast loading browser, but it's best known feature is probably the omnibar (web...
4. Wordpress 2.9 with youtube embed support Finally, one of the most sought after features for Wordpress doesn't have to come in the form of a plugin. One can now embed Youtube and videos from other video sites directly on Wordpress just by copy pasting the url....