Iphone users can download the app from the App Store. There are two versions of the app - a free version which allows 'read only' (called Tapatalk RO) and a paid version for $3.99 which lets you post replies, access private messages etc. Go to http://www.tapatalk.com/ for more info.
As well as ATDB there are 2768 other forums which can be viewed using this app. Below is some info from Tapatalk's website:
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Tapatalk is a forum application for iPhone, BlackBerry, Android and Nokia.
Tapatalk supports vBulletin (3.x and 4.x) and phpBB forums and forum owner can activate this service for free. Tapatalk supports all the usual forum functions plus full screen image viewing, image upload, caching (less reload), private messaging, all these features are accessible in just a few simple taps.
Tapatalk for iPhone:
Showing New and Unread Posts:

Full Thread Viewing and Pagination Support:

See Who's Online:

Reply to Post and Image Upload:

Some of the large forums activated Tapatalk support

Tapatalk for Android
Total Android Look and Feel

Same feature set as iPhone:

Quickly Reply to a conversation:

Latest and Unread Posts indicator and multi-tabs support:

Full screen image support - support landscape mode also

Check out http://www.tapatalk.com for more information!
