Usability 
Popular tech blog ReadWrite (formerly ReadRightWeb) is one of latest and largest web properties to replace it's separate mobile and desktop sites with a slick responsive design intended for both desktop and smartphone browsers. The new design works reasonably well in both although the fixed position sidebar jumps around annoyingly in desktop Firefox and images and text overlap badly in portrait orientation in the Windows Phone 8 browser.
The site's front page is about 1700 KB (1100 KB compressed) in size (individual item pages are generally smaller). It's usable with proxy based feature phone browsers like Opera Mini and Nokia Xpress but is too large to load in most embeded feature phone browsers. The large page size will also be a concern for users who pay for data by the KB or MB. The old ReadWriteWeb mobile site displayed the desktop edition's full editorial content, including images and comments in about 100 KB.
ReadWrite, which has been around since 2003, specializes in news and analysis of web sites, web based services and web technology with an emphasis on social media and mobile.