A pleasant Icecast-using website is n10as (pronounced "antennas") radio[0]. I'm a longtime listener.
Personally, I like to use Icecast alongside Mixxx[1], an open-source DJ software that I highly recommend, to do live mixes of dance music over the web. Mixxx comes with configuration settings for broadcasting live audio within the program itself without the need for any extra client.
[0] http://n10.as/