Blogger has a Android mobile app which makes blog posting on the go. Though the feature set is less, it's really an awesome experience to blog on a device.
It allows to attach phototo your blog either from your gallery or you can take a photo on the camera and directly attach it to the blogspot. Note that blogger android app uses your picasa web album to upload the photos.
Apart from this you can add label and your geo location information in your posts and nothing else. You cannot have the complete feature set of blogger's web features.
You can't add video, meta description, html editing, etc etc on the mobile app.