I Was Searching for some Local Database support for Windows Phone 7 in Google and Ended up with the list here .

1. db4o – Windows Phone database

db4o is an object based database that can be used in the silverlight applications / Windows Phone Application .It
offers you a lightweight persistence engine that stays close to your .NET objects and is a 100% .NET native code .

The db4o site also states that

“Using db4o in your Windows Phone apps is FREE!”

db4o can be used for free in any application that’s deployed on a Windows Phone device and available on the Windows Marketplace and this does not include the db4o instances running on the server side

Website : http://developer.db4o.com/Platforms/dotNET/WindowsPhone.aspx

2. siaqodb

siaqodb is object database engine that currently runs on .NET 3.5+, Mono 2.4+ , Silverlight 3 and 4 and Windows Phone 7. It was also one of the first provider that announced the support for WP7.

Here are some nice posts on how to use Siaqodb.

Website : http://siaqodb.com/

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