Android (and some not Android) device metrics
Google seems to be in the habit of making helpful little websites packed with info for developers. An apparently new addition to their line-up is the Device metrics page. It includes a list of common devices with some key data such screen resolution, dimension and aspect ratio - all parameters are sortable too. Although this information can easily be found elsewhere, having commonly used data in one place and delivered in such a usable form is undoubtedly useful.