I've just downloaded an app for the iPhone called Tapatalk.

It integrates nicely with vBulletin forums so you can read and respond better / easily rather than having to use the native browser (pain!).

I'm not sure how you get it intregrated but it looks free

Check it out:

Tapatalk - Online Community at your fingertips!

+ It's another way to expand the community. Looks like Love Systems forum is already on the case too.

MB