Let's Encrypt has moved to public beta,
and I've taken advantage of it. Why? Because a non-zero proportion of
the people intercepting your web traffic are bad guys. The less
plain-text traffic is out there, the less they learn.
It's often tempting, but usually an error, to allow control signals to
be sent by the same channel as the data. This is an example of why.
(Readers not in England, if any, please ignore.)
Have you even heard of care.data?