I'm trying to find a working version of the an up-to-date MGTwitterEngine iPhone project. The example app included with MGTwitterEngine is a Mac app which I can't get to compile, apparently due to multiple missing dependencies. (each time I try to resolve a compile error I just get even more errors...)
Is there a working example out there? Just a shell which lets you log in to twitter. (and which uses oauth, not xauth - which is deprecated).
The original source code is located on github. It looks like the last time it was updated was in September of 2010. I am not aware of any other updates as of recently. The original source is probably going to be your best choice.
Alternatively, there are many other Twitter libraries you can use.