As I see it, the most practical uses of public key encryption in blogging are going to be securing all those other things that we’re currently relying on a lack of idots to keep safe: Trackback, this FOAF thing, communication to community servers, and so on.
I’m hearing this more and more. Sam Ruby thinks that signing might be involved in his email comments experiment:
Signing is the next step, particularly given that e-mail clients already tend to have built in support for this. Ultimately, when the spam starts arriving, only signed e-mails will be accepted.