Here is a Free mobile phone application that can help you improve your vocabulary while preparing for TOEFL. It contains a list of close to 5000 most frequently appearing words in TOEFL. Demo video: http://www.youtube.com/watch?v=74F8U9DLGZ4
The application works on most mobile phones and should definitely be of great help to most of the readers here who are planning on appearing for TOEFL. Try it out
To try it out, just go to insta7.com
from your phone.
Your feedback on this will be appreciated. Hope everyone here finds it useful! All the best!