Looks like Facebook silently introduced encryption for chats in XMPP/Jabber clients (Pidgin, Adium, etc.): Its servers now support the use of TLS as defined in RFC 3920.
Facebook’s FAQs (1, 2) have not been updated accordingly yet.
Software Engineer and Consultant
As of today Google finally supports searching over SSL. Expectedly, you can use it via https://www.google.com/.
Firefox’s built-in search capabilities still use the unencrypted search, though. To remedy this I built an OpenSearch plug-in which makes Firefox use the HTTPS-based search:
(Read more about Google’s SSL Search here)