There's a sharing feature (multiple vaults) in the new 1Password 4 for Mac—but it hasn’t yet migrated to any of the other versions (including 1Password 4 for iOS).
Haven't tried it yet. But the key would be sharing individual passwords with the right people - not just having a shared vault where it's all or nothing.
There's no good way to share the passwords though... unlogged chat / IM / onetimesecret.com