We just posted an install guide describing how to install Doppler on your iPhone or iPod Touch. Please be aware: this is beta software. Also be aware: you need a jailbroken iPhone or iPod Touch
You can find a link to the guide in the Downloads section in the menu at the right.

If you are interested in testing Doppler for the iPhone or iPod Touch, we’ve made it easier for you to install it. We have a installer.app repository available now which will make the installation process a matter of seconds.
So if you are interested, drop us a message and will get back to you with the [...]