KyPass support various URI schemes in the URL field (http/https internal and all other schemes in their corresponding iPhone app)
iSSH have URI scheme support !
By typing <username> or <password> in the http field, <username> or <password> will be replaced by their value.
It means that you could enter ssh://<username>:<password>@example.com in one of your url field and KyPass will open iSSH with a authenticated session on example.com.
This page centralizes code samples for URI schemes available in many iPhone applications: http://wiki.akosma.com/IPhone_URL_Schemes