There are a couple of apps which can post to Drupal as well as the majority of other popular blogging platforms straight from your iPhone: iBlogger and BlogPress. I’m writing this from BlogPress on my iPhone, but the app also supports the iPad for all you lucky folks out there. With BlogPress you can view previous posts, save drafts, upload images to Flickr or Picasa and upload movies to YouTube, all of which can then be embedded straight into the post. Drafts can be saved to the app and are stored on the iPhone or can be stored on your Drupal site. No more excuses for not having enough time to blog!
If you know of any other apps for blogging from the iPhone, especially to Drupal, please add them in the comments below. Happy remote blogging :)