In a future version. (Although I read in many forums that Ninja Database is an option now. I just don't know if it is a good option or not) See comments in this thread:

http://social.msdn.microsoft.com/Forums/en-us/windowsphone7series/thread/1b93ca81-cce6-4143-9dba-0fb5487802c5

Even Ninja Database Lite is not free, but it's only 49.95:
http://www.kellermansoftware.com/p-42-ninja-database-lite.aspx
Not sure what benefits the pro version has in comparison to the lite...

And there are other options:
http://phone7.wordpress.com/2010/06/30/need-a-database-for-your-wp7-app/

>Hi James.
>The last time I checked, WP7, amaizingly, did not seem to have any local Sql Server built in. Not sure what the situation now is though.
>Would be nice if it supported whatever is the flavour of the month for local Sql databases is (SqlLite ? MYSql ?)
>Regards,
>Gerard
>
>
>
>>The short answer is no. This is a web app. But, the HTML5 specification does say it will support local storage. Now the issue is if the phone does not support html 5 (WP7) then that will not work as well. I think that the only way to have native support for multiple brands of phones is to write an app for each platform. BTW, since WP7 is really only supporting Silverlight, does Silverlight have local data support?
>>
>>
>>
>>>Hi James. Thnaks for that.
>>>Can you run jQM , disconnected,(i.e. can you download the app to the device and have not internet connection) on Android, Iphone and WM7.
>>>
>>>Lots of our users want this type of functionality because Connectivity can be so bad, but we cannot dictate what sort of unit they will have
>>>regards,
>>>Gerard
>>>
>>>
>>>
>>>
>>>
>>>>I have been using it now for about 4 months. It helps making a web app look more like a mobile app. Here is what I have working so far. It is not yet complete but getting closer. www.rcsfind.com. It will not work with < ID8 but will work with Chrome and FF. Using a browser, you will get an ugly page with a yellow header. Click on Old Version to see what JQM is doing for me. The GPS search will not work for you but you can go to "Select Area" and see more that way. Use 1200 for the address search.
>>>>
>>>>UPDATE: I should have added that the app does not look all that well an a browser unless you size it down to the size of a smart phone. Also, once the main page is loaded, all data access is done through ajax. Much quicker then reloading the pages all the time.
>>>>
>>>>>hI JAMES. Tahnaks for your reply.
>>>>>Just wondering if you have used jQueryMobile and what have you found to be the benefits
>>>>>regards,
>>>>>Gerard
>>>>>
>>>>>
>>>>>>If you are serious about doing html for mobile devices then you should look seriously at jquerymobile.com.
>>>>>>
>>>>>>>Hi James.
>>>>>>>Thanks very much . That has worked perfectly.
>>>>>>>Regards,
>>>>>>>Gerard
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>You need to add a meta tag to tell the browser to render for mobile phones. This is the one I use.
>>>>>>>>

>>>>>>>><meta name="viewport" content="width=device-width, height=device-height, user-scalable=yes,
>>>>>>>>initial-scale=1, maximum-scale=5.0, minimum-scale=1.0" />
>>>>>>>>

>>>>>>>>
>>>>>>>>>I Have a Web Site set up, with just a few controls on a form.
>>>>>>>>>These render fine on a Normal PC screen , but they appear quite small if they are displayed on a Smart Phone
>>>>>>>>>Is there any way I can code them, so that the controls will fill the screen if being looked at via a SmarPhone, or at least look a bit better?
>>>>>>>>>Tia
>>>>>>>>>Gerard