Last Updated 2/6/2012
Responsive theme design is the latest trend in WordPress web design and development circles in response to the changing ways people access and use the web. Due to the particular growing popularity to access websites on tablets and smartphones, it has become increasingly popular for multipurpose devices to reveal a beautifully designed website. Your website will adjust with these things, no matter if it is a Kindle, netbook, TV, iPad or smartphone.
This means the website should look great whatever the screen size and device the visitor uses, without the need for separate mobile themes, plugins or stylesheets.
Fluid & Responsive Design

Backbone
Price:
Standard Package: $79
Developer Package: $159
Preview | Download

Link: Backbone WP Theme
Lulu
Price: $35
Preview | Download

Link: Lulu WP Theme
Aware
Price: $35
Preview | Download

Link: Aware WP Theme
Propulsion
Price: $40
Preview | Download

Link: Propulsion WP Theme
Beveled is a clean and responsive WP theme that showcases your work.
Price:
Preview | Download

Pure WP Theme is a responsive design from ThemeLoom.
Price: $50
Preview | Download

SuperSlide is a is a full-screen slideshow experience premium portfolio WordPress theme.
Price: $49
Preview | Download

Elemin is a really stylish minimal WordPress premium theme from Themify.
Price Standard: $39, Developer: $59
Demo & Release Page | Download

Simfo is a clean WP design that works on all screen resolutions including mobile devices such as the iPad, Android, BlackBerery and iPhone. Made by Themify.
Prices: $39 (Buy 1 Get 1 Free)
Demo | Download

Buro is a premium WordPress business theme with a responsive layout from WooThemes.
Price Standard: $70, Developer: $150
Demo & Release Page | Download

Grido is a responsive premium WordPress theme from Themify.
Price Standard: $39, Developer: $59
Demo & Release Page | Download
Responsive Design

Foxy is a unique premium WordPress theme from Organized Themes designed for fashion sites, restaurants, cafes or other business websites.
Prices Foxy Theme Package: $45
Demo & Release Page | Download

Reveal is a responsive portfolio WordPress theme from Theme Trust.
Price Reveal Theme: $49
Demo & Release Page | Download

React is a clean and simple premium WordPress business / portfolio theme from The Theme Foundry.
Price: $68
Demo & Release Page | Download

Modernizm is a modern premium WordPress theme from Colorlabs for online magazine, news portal or personal web sites.
Price Standard: $49, Developer: $99
Demo & Release Page | Download

Responsive is an optimized portfolio site for WordPress from Templatic.
Price Standard: $65, Developer: $99
Demo & Release Page | Download

Clean is a responsive and simple theme with infinite scrolling and touch swipe slideshow from ThemeTrust.
Price Standard: $49
Demo & Release Page | Download

Fluid is an elegant premium portfolio theme with a responsive layout.
Price: $59
Demo & Product Page | Download


Hybrid is a clean magazine theme or blog theme.
Price: $59
Demo & Product Page | Download


Super Skeleton is a well organized responsive WP theme built using HTML5 and uses 20 bonus template files.
Price: $35
Demo & Product Page | Download 
More WordPress Responsive Themes

ColorLabs
Elegant Themes
Gabfire
NattyWP
Organic
Pagelines
RichWP
Solostream
StudioPress
Templatic
Theme Trust
Themeforest
WooThemes