TweetSharp and Windows Phone simple OAuth "oob" + Post to twitter sample - by Rahul Mathur Feel free to copy, modify and use in free/commercial applications and test cases w/o attribution.
The application uses the amazing TweetSharp library: https://github.com/danielcrenna/tweetsharp <3
The entire sample work process has been explained inside the project with commented code.
Feel free to contact me on Twitter - @weemundo or email - rahul@wpsauce.com
I hope this piece of program is useful for giving you a headstart on twitter oauth.