Forums Pro ($0.99)
Forums Pro Free
Forums Pro enables users to easily read forums, sign in and post, track read and unread posts, download topics for offline, and send private messages. It is designed to interface with online bulletin boards running Invision Power Board 2 and 3, phpBB 2 and 3, and vBulletin 3 and 4 that are in English. Forums Pro does not require administrators to install any special code on their forums. If the forum you are reading uses customized HTML, Forums Pro may have difficulty parsing the data. Forums Pro is also available in a free, ad-supported version.
Here are some images of the site I took while using Forums Pro Free: