This tune is also sung to the piyut "Nirdi Natan Reho" on Shavuot or Simhat Tora, as well as "El Ram" for the Bakashot of Vayehi.
I like to sing this tune on Pesah for:
Yigdal (first night)
Arguably the nicest tune for Kedusha out there. Made famous by R' Haim Louk. Enjoy!