I have an HTC Tilt 2 and have been looking for a way to listen on it. I finally found it.
There is a free mobile browser call 'SkyFire' which supports Flash 10. I don't know how it works, but like the website says, it just works.
Install the app, go to LiveATC.net, select the airport and click the link for the feed that 'requires flash'. I use it all the time.
The browser isn't really too friendly as Opera, but it does everything. I even listen to Sirius online like I would my deskptop computer.
Here is the link: http://www.skyfire.com/