Free Usability Reviews
I have started a small business which offers usability advice and guidance to developers. We're currently offering free usability reviews of Android and iOS apps. All you have to do is visit our site and fill in the contact form.
I have put loads of other info on the site for you to peruse at your leisure too. Even if you're not interested in a review I hope you can still learn something from the content. Also, if you have any direct questions about app usability I can answer them here.
As a new XDA user I'm not allowed to post a link to the site, the masked url is ultrausability%com.