Tweetz Desktop is a Windows twitter client designed to sit comfortably in the corner of your desktop. It can optionally display attached images inline. Tweetz displays your home, mentions and direct messages in a single view reducing the need to switch timelines. Tweetz supports real time updates, posting with media and keyboard shortcuts.
NOTE: This software is free, but it is ad-supported. It offers you the option to install third-party software during installation, if you would prefer not to, then pay attention to the installer.