BlogPress
My favorite mobile blog post editor, supports cross-posting images to Flickr, supports multiple blog platforms including WordPress
WordPress
I use this free app mainly for moderating blog comments on WordPress sites on the go.
TwitPict
My favorite free app for sharing geo-tagged photos to TwitPic http://twitpic.com/photos/wfryer
Download
PicPosterous
Uploads multiple images to a Posterous blog, on a single post as a nicely formatted gallery
Pixelpipe – Post & Upload to the Social Web
Supports uploads of multiple images or videos to multiple websites (like Flickr, Facebook, Youtube, etc.)
Animoto Videos
Supports both the creation of short, Animoto videos with still images and upload/sharing of final videos
