I should have linked a couple others. I need to clean up my bookmarks properly one of these days. A few of those are a little long in the tooth and although good for learning, aren't necessarily relevant anymore.
As Yast just pointed out, Twitter Bootstrap is awesome. It's pretty big, but it looks great and has so much functionality built into it, it's an excellent prototyping tool. There are some WordPress forks of it and people are using it as the basis for various themes.
There are a shit ton of nice responsive theme's showing up on Themeforest these days.
I currently use a customized hybrid of HTML5 Boilerplate - A rock-solid default template for HTML5 awesome. and Skeleton: Beautiful Boilerplate for Responsive, Mobile-Friendly Development. You could substitute Skeleton for 320 and Up or the 1140px grid system or use Mobile Boilerplate or Bootstrap, or just roll your own, it's no biggy really. Once you have your grid system defined you pretty much use it over and over again.
Another one of my favourite resources is CSS3 PIE: CSS3 decorations for IE for using some of the most desirable CSS3 effects in IE 7,8 & 9, like rounded corners, gradients and drop shadows.
Another link to a responsive images resource for WordPress http://viewportindustries.com/blog/automatic-responsive-images-in-wordpress/
As Yast just pointed out, Twitter Bootstrap is awesome. It's pretty big, but it looks great and has so much functionality built into it, it's an excellent prototyping tool. There are some WordPress forks of it and people are using it as the basis for various themes.
There are a shit ton of nice responsive theme's showing up on Themeforest these days.
I currently use a customized hybrid of HTML5 Boilerplate - A rock-solid default template for HTML5 awesome. and Skeleton: Beautiful Boilerplate for Responsive, Mobile-Friendly Development. You could substitute Skeleton for 320 and Up or the 1140px grid system or use Mobile Boilerplate or Bootstrap, or just roll your own, it's no biggy really. Once you have your grid system defined you pretty much use it over and over again.
Another one of my favourite resources is CSS3 PIE: CSS3 decorations for IE for using some of the most desirable CSS3 effects in IE 7,8 & 9, like rounded corners, gradients and drop shadows.
Another link to a responsive images resource for WordPress http://viewportindustries.com/blog/automatic-responsive-images-in-wordpress/
imp: