SDF 2.2 has a new namespace called OpenNETCF.AppSettings.  We created this group of classes for those times when you'd like to be able to retrieve and store values in an XML settings file.  Here's a quick peek at how it might be used:

AppSettings settings = new AppSettings("\\MyApp\\ApplicationSettings.xml");

if (!settings.Groups.Contains("MyGroup"))
{
    settings.Groups.Add("MyGroup");
    SettingGroup group = settings.Groups["MyGroup"];
    group.Settings.Add("BoolSetting", true);
    group.Settings.Add("IntSetting", 21);
    group.Settings.Add("StringSetting", "hello");

    settings.Save();
}

// update a setting
settings.Groups["MyGroup"].Settings["IntSetting"].Value = 42;

// save back to the file
settings.Save();

string myValue = settings.Groups["MyGroup"].Settings["StringSetting"].Value
bool myOtherValue = settings.Groups["MyGroup"].Settings["BoolSetting"].Value