I just created a Vietnamese dialects app. You can download it at Google Play:
https://play.google.com/store/apps/deta ... hvndialect
This app can help you to learn how to speak, listen and spell Vietnamese words in the Northern and Southern dialect.
http://pleasefindencoded.blogspot.de/20 ... ollow.html
It's nothing fancy but still interesting if you're interested in the differences between N-VN and S-VN. Also it helps you to pronounce the words correctly.
If you've downloaded it, tell me what you think about this app. Any improvement-suggestions (more words, misspelled words, etc.) are welcomed.
If you have cool ideas for VN learning Apps let me know. I may publish one for iOS, Windows and Blackberry.