Comment Not necessarily (Score 4, Interesting) 487
Enter the Monkeysphere, a project that leverages the GPG web of trust to build trust paths for secure browsing (among other uses). From the site:
When you direct the browser to an https site using the Monkeysphere plugin and validation agent, if the certificate presented by the site does not pass the default browser validation (using standard, hierarchical X.509), the certificate and site URL are passed to the validation agent. The agent then checks the public keyservers for keys with UIDs matching the site url (e.g. https://zimmermann.mayfirst.org./ If there is a trust path to that key, according to your own OpenPGP trust designations, the certificate is considered valid, and a browser 'security exception' is put in place to allow connections to the site.