In this article, Xianzhong Zhu introduces a new native database solution, called Sqlite Client for Windows Phone, provided by CodePlex, together with other associated programming tips.
Source: DotNetSlackers
Either from a user's perspective or from a developer's perspective, Windows Phone 7 has brought us dozens of new and exciting features. At the same time, there are also numerous missing features in the current Windows Phone 7 Series expected by various kinds of users. One of the representative regrets may be lacking local database API – the current Windows Phone 7 OS only supports access to data via XML, Isolated Storage, and Cloud Storage. Do we really have no other choice? Not necessarily so. Luckily there are several developers and teams have been working to fill this gap.