Generation Media Group have launched a cool app for browsing vBulletin forums called BerryBlab. The app is really great at delivering a mobile version of a vBulletin forum, but there are some catches. First, the forum obviously has to be powered by vBulletin, and second, the forum owner must install a plugin.
The app is available as a freemium service, with the free version allowing you to add multiple forums, view threads, as well as read private messages. The premium version ($2.99) allows you to reply to threads, subscribe and unsubscribe to threads, view images, as well as reply to private messages