We've just uploaded a new BlackBerry PlayBook app to the BlackBerry App World. I have linked to a couple of videos of the app in this forum some while ago:
At this stage it is very much a demo. That is why we have made it a free app. We are looking to build on this work and develop an app with advanced mapping and GIS capabilities along the lines of the ArcGIS Viewer for Flex:
Its built in AIR and uses the ESRI API shown above. We'd welcome as much constructive feedback as we can get from the community. This is work in progress, but feedback will help us build a more polished app. We plan to provide an improved base free version, with customized versions - including advanced functionality - being fee based.