I remember installing I2PD and going to http://i2pd.i2p to confirm my router's working. I then looked at the sites shown on the page and explored them including (http://tube.i2p). The site returned with a 503 response which made me wonder what was the site about(only clue I can get is its button in http://i2pd.i2p, which has a YouTube logo).
You got some ideas on this?