I’ve been pottering about with OH1.8 for a while now and I’m very happy with it, but just thought I’d try out OH2 to see what newer, nicer looking UI’s were included. My favourite is definitely Paper UI, however at the moment I can’t see how to organise a dashboard on it (put switches in one place/group, virtual switches in another, scenes in another, weather in another, etc). It all just kind of streams down the page.
Paper UI is for configuration, you can use it to control openHAB, but it would be more common to use Basic UI or Classic UI, these make use of the .sitemaps (like in openHAB 1)
Do you already know about http://docs.openhab.org/ ? This is the official documentation (growing fast) for openHAB 2