Microsoft published the "Tagged Objects for Surface 2.0" whitepaper that includes some best practices that will allow you to use tags to detect physical objects on the Microsoft Surface device.
"Are you tasked by your customer with implementing a solution that requires table-to-object interaction on a Microsoft Surface device? Do you need to manage large numbers of unique identities using only Surface tags? What are the security implications of trying to authenticate by using tags? What is the difference between Microsoft Tag, Surface tags, QR Codes, and barcodes; and how are they all used on Microsoft Surface? Read this Whitepaper to learn more," reads the Whitpaper description.
Microsoft Tag blog today posted a video showing off "how to create an object that has two reflective regions of different sizes." The video shows a way to track physical objects on Samsung SUR40 for Microsoft Surface
You can download the Whitepaper Tagged Objects for Surface 2.0 Whitepaper from the Microsoft Download Center.
Surface 2.0 is really starting to gather some momentum and applications like the GLOBALedit App from Industrial Color, which was shown at the NRF Convention in January uses the 360-degree user interface and multi-touch capabilities to bring photo editing, image markups, layout creation, and creative review sessions to life.