I have developed a iPhone application that targets at helping people learn Vietnamese in the easiest and most interactive way.
You can find detail about this application at http : // www . thuynhanproductions . vn / apps / ivietnamese/
In brief, the application will help people to get known the language with the most basic features.
Together with popular sentences and dialogues in common contexts.
There is also a vocabulary area to find words.
Hope it can help with your learning a bit.