Ubuntu Gutsy & Zattoo
works, but after some glitches. Zattoo (like many other commercial applications udner linux) uses OSS instead of ALSA. Why? Is OSS more *nix compatible ?
Anyway, as suggested, if you are using ALSA you need some glue to OSS to make many strange adio/video apps working (like flash player). This is true for zattoo too.
# sudo apt-get install alsa-oss
Then start Zattoo with
$ /usr/bin/zattoo_player