OK, so here is what happened.

I have two internal drives on my Mac Pro, a storage and a system drive. I was installing Leopard and I selected the storage drive rather than the system drive. Ooops. I didn't realize it until I booted and I had a clean desktop, no email etc etc.

What I want to do is uninstall Leopard from my storage drive, then reinstall on the correct drive. What is the best method to clean up my mess?

Do you have anything on the storage drive? I assume you didn't use Erase and Install, and that you are upgrading from Tiger or Jaguar. What I would do is start up from your system drive (old OS) then just delete all the system files from the storage drive. Then just install like normal, but choose the right drive this time!

I wasn't sure how to boot from the other drive so my solution was to put the MacPro in firewire mode, go in with my laptop and delete Leopard from my storage drive. I reinstalled Leopard on the proper drive and everything is working fine.

The moral of the story, pay attention when installing software...ha

Change the startup drive by going to System Preferences > Startup Disk.
Glad you got it working though!