Got news on a quite new project on CodePlex through twitter and @gcaughey; A database framework project for Windows Phone 7 Silverlight and XNA projects.
From the project description it looks quite promising.
This project implements a Isolated Storage for Silverlight (IsolatedStorage) based database for Windows Phone 7. The usage of this software is very simple. You create a new database by Calling CreateDatabase. You can add tables to the database by calling db.CreateTable<T> where T is the type of entity to be stored in table rows. You can save database by calling Save, and open the database by calling OpenDatabase. This database supports version changes, so you can update your application and still be able to open the database. You can look for basic use of this database by examining test Silverlight application. Encryption has been implemented; just provide a password to use encryption. Also lazy loading has been implemented. If you open database with lazy loading flag, tables will be loaded when first accessed. Feel free to look documentation help file under current download for API details. The source code file contains unit test project that you can also examine for usage details. The database consists of table objects, each one supporting any number of columns.
Getting an ORM DB framework for Windows Phone 7 would be greatly appreciated, and i am looking forward to follow this project. Check it out and read more here: http://winphone7db.codeplex.com/ The project is started and maintained by Sergey Barskiy. Please give him a hand if he requires one!
