Add and Edit WordPress Posts From Your Android Phone
I went to my wordpress site today using my phone. The site displayed using the mobile theme and I noticed a link at the bottom to "Download WordPress for Android".
I installed the app and here I am using it to write this post. Not only can you modify posts but you can modify pages as well.
It supports basic formatting such as bold, italics, underline, link, and block-quote. Tags are also supported.
I am impressed that it also goes above and beyond the basics by allowing you to upload media files, add categories, and view stats complete with a visial graph.
Watch a video and find the link to the application at http://android.wordpress.org/