SSHKeychain for Mac

From Bart Matthaei:

SSHKeychain is a graphical front-end for ssh-agent and ssh-add on Mac OS X.

It basically does everything that ssh-agent and ssh-add will do for you, with the following additional options:

• Remove all keys from the agent after sleep or after a minimum period of sleep (especially useful for notebooks).
• Remove all keys from the agent when a Screensaver is detected.
• Remove all keys from the agent when the Apple keychain is locked.
• Add keys whenever ssh is trying to use the agent with no keys on the chain.
• Run with a statusbar item, a dock item, or both.
• Keep a list of default keys, which you can add with one click, or on startup.
• Store the passphrases for your private keys in the Apple Keychain.
• Add the necessary variables to the global environment (~/.MacOSX/environment.plist),
  so you can use SSHKeychain with all your programs (Terminal, Project Builder, etc).
  You can also edit the global environment from within the Preferences.
• Can lock/unlock the Apple keychain from a menu item.
• Works seamless with the commandline tools. (i.e. tracks activity coming from the commandline tools, and updates it's UI.)