This is a screenshot of the "marginal UI" output of the monkeysphere ssh-proxycommand. The user knows Jamie, and has assigned Marginal ownertrust to him, so his certification is visible but not sufficient on blanco's host key:

Simple Marginal UI screenshot

Here is a more complex situation, involving multiple hostnames (a common misspelling, in this instance) with different calculated validities, and multiple certifiers:

Complex Marginal UI screenshot

More screenshots may be available at