RIM is pulling up developers who have had access to BlackBerry 10 Cascades for a bit and they are showing off some of their creations. Xtreme Labs who has been building cross platform and BlackBerry apps for years talking about building with cascades and their work on a new BlackBerry 10 Accuweather app. It looks slick and they show how simple the Cascades elements are to create slick apps.
The also had another company (macademics?) showing off an app they are opensourcing that demos for. It shows a sports team comparison based on social interaction. The right hand side is a graph that shows what team is getting more buzz which is rendered in OpenGL. On the left is cascades elements.
Also of interest is Wikitude showing off their Wikitude app on the developer alpha device. They even have aliens!!!