In addition to the HowTo, it would be good to standardise newsletter layout, including things such as:
A header or intro of some sort
A footer before unsubscribe
A personal paragraph divider wherever suitable
Gravatar for Trustroots (for emails re: new blogs, empty face now)
It would also be good to figure out whether the blog post summary can be edited for the email that is sent out to subscribers.
In addition to the HowTo, it would be good to standardise newsletter layout, including things such as: