I like Posterous (http://posterous.com/). It is extremely easy to set up an account and it does useful things via email. I have posted this to my Brookes Blog and my Posterous blog from my email client. It is also possible to update Flickr, Twitter, Facebook, other blogs. See http://posterous.com/autopost. I am still exploring the service, but I like what I see.
Now, if you could add tags from inside the email.
rWorld2 