Just updated to Edgy and installed Beryl following these instructions.
Added these to my sources:
deb http://www.beerorkid.com/compiz edgy main-edgy
deb http://media.blutkind.org/xgl/ edgy main-edgy
deb http://compiz-mirror.lupine.me.uk/ edgy main-edgy
deb http://ubuntu.compiz.net/ edgy main-edgy
Then:
sudo apt-get update …