We use Monkeysphere to allow users to authenticate our SSH host keys using their PGP web of trust. Future plans include managing user keys (authorized_keys) as well. Monkeysphere regularly searches for and fetches (potential) OpenPGP keys for all users to check for new and/or revoked keys, which causes some load on keyservers. In order not to annoy operators of (other) public keyservers, we run our own. As a nice side effect we contribute back to the OpenPGP community by being part of the SKS keyserver pool, similar to what we do for NTP.
For non-emergency calls, preferably send email to the administrative contact.