Usability 
Roland Tanglao has been blogging since 1999 and has over 60,000 photos on Flickr. He's based in Vancouver and is one of the founders of the Drupal hosting service, Bryght. He is now with another startup, CrowdTrust.
Roland blogs a lot about mobile with indepth pieces like an exhaustive "stream of consciousness" 10 part review of the Nokia N97 based on his experiences using a review unit as his main phone for 11 days. Although Roland reports a litany of bugs and UI shortcomings with his early firmware unit, he still recommends it, but "only for S60 geeks". Mobile version of his blog was created from the RSS feed using mowser.mobi.