I would love a native iPhone app that could at least post to wordpress inc image support from the camera roll.
The Typepad app copied would be a great start, but further down the line I would like the native app to have admin elements in to delete/add pages, comments etc. The new iPhone firmware can now pass position data to 3rd part apps, and the built in camera app now does geotagging. It would be great to have an option to tag a post by location. I could see something interesting, take a picture, add a quick note and then this can be posted to my blog. When viewing the blog post, the location could be a link to see a mini map in google. Would be v cool.
