Usability 
Self described "mobile fanatic" Ewan MacLeod's long running, extremely popular and always fascinating blog focuses on mobile carriers and industry news but covers just about everything mobile related along the way. I know "mobile carriers and industry news" sounds boring but Mobile Industry Review is anything but. Ewan doesn't doesn't parrot vendor news releases like so many industry themed sites, he wittily cuts through the crap to point out smart and dumb business moves and what they mean for us ordinary mobile users. Mobile Industry Review is another WordPress blog using Andy Moore's plugin to create the mobile version.