Gmail Reader is an stand-alone program of GMail, it can read ,send , upload file, star and trash your email without login with your browser.

• Fast. without loading the javascript, all you have to wait is just the download time(at the exact opposite side of the spectrum of official GMail!)
• Read, check and compose gmails in conversations
• Collapsed conversation. All still “work” here.
• Reply to a conversation by a simple click.
• Full attachment support: uploading/attaching and receiving/downloading.
• Perform actions on messages, including: label-applying/label-removing/(un)star-ing/archiving/deleting, etc.

http://www.gmail3.com/