Keychain2Go is the missing link for Keychain sync between Macs and Macs and iOS Devices.
Now that MobileMe keychain synchronization is unfortunately shutting down, Keychain2Go can help to to keep your keychains in sync using Bonjour. iCloud sync is not there yet.
Additionally you can, for the first time, access your keychain from iOS devices.
Requires Mac OS 10.7.2