I've added everyone to the email alert option on the blog so that when new items are posted you will receive an email in your in-box. (You can be removed at any time, just let me know.)
To post directly to the bog email email@example.com. That will create a new entry. To make a comment on an old entry, use the comment feature.
I'm not sure this format will be the most user-friendly for our purposes, but it's what I'm most familiar with right now. If you have an idea of another site/blog format that would work better, please let me know!