Typepad, Six Apart's premier blogging service, has recently launched its very own iPhone application called, not surprisingly, iTypepad. Just head on over to http://i.typepad.com from your iPhone and you'll be forwarded to the login screen. From there, you can post to your TypePad blog without having to be near a computer.
iPhone link: http://i.typepad.com/
Web site link: http://www.typepad.com