I have a co-worker who installed the gnome desktop on top of 10.04 LTS Server. His gnome session is running under ssh-agent, and if he runs ssh-add directly, it immediately prompts for his passphrase and adds the key. He hasn't restarted the session, so I'm not sure if ssh-add is required for every session.
I'm use to OS X, where ssh key passphrases are stored in the keychain, so that you only need to remember your account password. Is there a similar central password storage with a graphical interface for Gnome? Is it standard on the Desktop edition, or is it an additional install there as well?