I set up a an account on Posterous a long time ago and only used it a few times. Well today I was directed back by another user's tweet and decided to try it again. I've added a few autopost accounts and am seeing how that works.
If you can send an email with an attachment, you can use Posterous for your blogging platform. Easy peasy. I'm attaching a photo that will also be added to my Flickr account. I think I will start using this service regularly.