OK! So you just installed Compiz on Gutsy and....
1. If you used Treveno's repository and upgraded to Gutsy, your Compiz Fusion will not work. Here is how to fix it on Ubuntu Forums
2. Looking for CCSM (the super sweet CompizConfig-Settings-Manager) then:
sudo aptitude install compizconfig-settings-manager
3. 3d windows is not currently compatable with the version of Compiz in Gutsy
4. Emerald is available, just install "emerald" you can get a theme pack from here: theme.tar.gz
Have fun!