I just installed Silverlight 3 last Friday.  One feature that I was hoping to see fixed was localization in Silverlight.  Ideally, I like to bind localized data, such as labels in XAML.  For example:

<UserControl.Resources>

<resources:ModuleResources x:Key="LanguageResource" />

then,

<TextBlock HorizontalAlignment="Center" Margin="7,0,7,0" VerticalAlignment="Center" Text="{Binding Source={StaticResource LanguageResource}, Path=SomePropertyName}"></TextBlock>

This works great, but there is one issue.  Even though I mark the resource as public, any time I add a new value or edit and existing value, ModuleResources .Designer.cs gets re-written, and its constructor is marked as internal, not public.  If I run the app, I get the dreaded unknown type exception.  At that point I have to manually edit designer file and mark constructor as public.  Not a major problem, but I would like not to have to do this.