Usability 
Remember Mathew Miller at ZD Net's Smartphones and Cell Phones? He's the guy who wrote the ultimate T-Mobile G1 launch day review with five videos and 260 images including a shot of every single screen and dialog box on the phone!
Matthew's back with a new site, his third and it covers my favorite mobile hardware brand. It's called Nokia Experts and the topic is Nokia phones and software for them. Nokia Experts is available boyj on the full web and on the mobile web. The mobile edition is created with Alex King's WordPress Mobile Edition plug-in. There is no special mobile URL, if you go to nokiaexperts.com with a mobile phone you should get the mobile formatted version
Mathew has been witting about portable electronics since the days of the original Palm Pilot. think he started at PDAGeek and then went on to create two blogs under the ZD Net Blogs umbrella; The Mobile Gadgeter and Smartphone and Cellphones I've been enjoying his writing for a long time, he's an excellent writer, his reviews are very through and he doesn't hesitate to point out the flaws in the devices he covers.
November 2011 - No longer updated