As you can see, I soon replaced the Tuner with a more modern TEAC one that supports DAB+ and internet radio. It also has some unified remote control solution, but I didn't have the time to build some kind of bridge for that. But it wouldn't be that hard, would it? There's already docbender/Onkyo-RI, so I would only need to work on the TEAC side.
I've played with the thought of replacing the CD Player with a CD Changer, but looking at the eBay listings, that seems like a bad idea: they seem to break easily.
Of course, there are speakers connected to the system. I got a pair of Teufel Ultima 20. Is that brand even known outside Germany?