One of the things I’m cautious about is logging onto my own blog, and other self-hosted sites that require authentication, over public wifi. Unless I use server certificates, my WordPress and other passwords are in danger of being captured via a promiscuously-configured wifi adapter on the same subnet.
Whilst I really ought to get a cert for my blog (they’re so cheap now) a browser rule to proxy via SSH tunnelling seems like an easy security measure to take. Added to the to-do list!
Looks relevant for Ubuntu: http://www.ubuntugeek.com/manage-ssh-tunnels-with-gnome-ssh-tunnel-manager.html. Now all I need is a per-site proxy configuration plugin for Firefox…
(Update July 2015: this blog is now being served via SSL. Still like the idea of this, though!)