It took me quite awhile to get around to trying the WordPress iPhone app. Writing thisl post seems to be easier than entering the title and tags. This is because the auto correct/predictive text doesn’t seem to me enabled for anything other than the body of the post.
Adding a photo is pretty easy, although I can’t see it in the preview. You can choose a photo from your library or take one fresh.
For mobile blogging, I think email to Flickr to wordpress works fine. I guess this would come in handy if you wanted to bypass Flickr.
