Here is a basic FAQ for vBulletin's mobile applications.
This FAQ will be updated.

What is it?
The product that will be available is an "app builder", it allows you to build a branded custom iPhone and Android app for your vBulletin website.

Can I try it out?
Sure. - Apple
(here it is running on vBulletin 3.7)
And here too. - Android

What platforms are you going to support?
Apple devices running on iOS 3.1.3+ (older versions may work fine - no promises though )
This means, iPad, iPod touch, iPhone 3 & 4
Android devices running version 1.6+

Are you creating an iPad specific version?
The iPhone app we have contains HD images, which means it looks/works fine on the iPad. This is in addition to the standard vBulletin skin working well in Safari on the iPad. We currently do not intend to create an iPad specific app.

What other platforms are you going to support?
Other platforms may be added too depending on market-share and their ability to support the basic vBulletin functionality.

I have a symbian/Blackberry/windows mobile, will you support me?

We have a mobile skin which will support...