Sydney has a few user groups which are great to show off Microsoft products and API’s. Still, Mich Denny has pointed to the new Sydney ALT.NET user group for those subjects that fall outside of the mainstream domain.
In particular, I’m looking forward to see RhinoMocks in action.
There are a lot of great ideas that don’t get enough exposure simply because there is probably too much to learn these days already. Nevertheless, someone who writes code or an architect will always benefit from at least knowing these technologies exist and how they can be applied.