Email is the tool people are most comfortable with

People like to use the tools they know best, because they want to use them, not think about them. The folks at Posterous have apparently realized this, and have created a service where people can "blog" using the tool that everyone knows how to use: email.

Another benefit for those of us who have to worry about public records laws is that the "original" is the email used to send the post, and we already have ways of meeting those requirements for email.