MetroTalk 2.0 is now available for download here. This is a major update, that brings a large number of new features and performance improvements. An unread conversation counter is now available for the live tile, along with many other changes; please visit the Changelog page for the full list.
Please note that this version, also brings a complete overhaul of how settings are stored on the device. Thus it is highly recommended that you first remove any 1.x version you currently have, before installing this new release.