The release - detailed here at Google and which can be downloaded by pointing your device at http://gmail.com/app - adds a number of new features, including...
- Faster, more Gmail-like user experience
Gmail for mobile devices is easy to use and now even faster than before, with the same functions and look and feel as Gmail on the web. Once installed on your mobile device, you're just a click or two away from the messages in your Gmail inbox.
- Easier on data consumption
We streamlined the application to use about half as much data as before - reducing access time and data cost.
- Web and mobile in sync
Your Gmail account stays in sync whether you access it from your PC or your phone. Send an email from your mobile device and you'll find it in the 'Sent Mail' folder on your PC.
Gmail for mobile devices allows you to search through your entire Gmail archive in seconds. Simply click on the search menu option and input your query.
I'd love to tell you how well it runs on my MDA Vario III, but, er, it's not installing properly currently! Does it work for you? Oh and Google - where's our native GMail for Windows Mobile application?
Source: Google Operating System