At a recent art spin I was treated to a performance of The Element Choir led by Christine Duncan.
They push choir into the realm of experimental music. Mostly wordless, there's improvisation and unusual sounds prompted by Christine's expressive gestures. I enjoyed it as it pushed music into a fun, playful and unexpected place. It seemed to give greater freedom for individual members to let their uniqueness shine within the choir.
There's a few videos of them online, but it was difficult to find one that I felt really captured the spirit of the concert I witnessed. So I will leave you with a short excerpt recorded during nuit blanche 2009 and suggest you take the oppurtunity to see them live sometime.