You are an experienced programmer and have a problem with the engine, shaders, or advanced effects? Here you'll get answers. No questions about C++ programming or topics which are answered in the tutorials!
Or postprocessing filters such as gaussian blur. That would require RTT and either shaders or some image manipulation. Anti-alias for D3D can be simply enabled upon Device creation, for OpenGL you'll have to wait some more (Linux support is in the SVN, I'm still waiting for the windows code to be sent in - I might hack it on my own someday).