Get Vocabulary List here.
This is a great app to carry a list of vocabulary to study where ever you go. Log new words, quiz yourself. At the $1 price tag, there are very few downloads. Everyone (including me) wants free stuff.
I want this to be useful for students! Now it is free:
Get Vocabulary List Lite here.
The $1 version now has an additional feature to import/export lists to your gmail account. You can send yourself a pipe-delimited vocabulary|definition list you crafted on your computer and then study on your phone.