Yaaic is already quite useable and as the client is the homepage is also still in some beta (or even alpha) state.
The client now has a nice transparent background enabling you to view what's behind the client. There are some screenshots available!
Currently I'm implementing multichannel and multiserver support as there's only a single window for everything as by now :)
In the Videos section is now a video of the early development version. Stay tuned for further updates :)