Running a WordPress site? This app allows you to add, maintain posts and even read through comments and approve them if needed.
Blogaway for Android (Blogger)
A simple blogger client for your Android phone
sendy, posterous client
Maintain your Posterous Blog using this simple client.
Post directly to Tumblr using this app on your mobile
Pictures say more than words, use Moby (mobypicture.com) to post pictures directly to your favourite social networks.