Almost all Twitter clients in the Android Market support photo uploads and allow you to upload your photos to popular image hosts like Twitpic, Yfrog etc – but what we need is a separate client for uploading photos on Twitter.
Picture Tweeter is one such app that allows you to upload photos to Twitpic and publish it on Twitter with your tweet. It is a very small app that only lets you upload photos. You cannot view your Twitpic profile or view other public photos from this app.
You can choose a photo from the Gallery or take one and upload right from the app. Simple,eh?
Unofficial Android TwitPic Uploader Client
Download Picture Tweeter from Android Market for free!