WPF Alphabet is a application that I created to help my child learn the alphabet. It displays each letter and pronounces it using speech synthesis. It was developed using WPF and c# in about 3 hours (so its kinda rough). I went ahead and uploaded it to codeplex for those in similar situation or just wanting to see a particular WPF feature.

I would also recommend Scott Hanselman’s BabySmash!.

Specific WPF Features:

• DispatcherTimer (WPF)
• SpeechSynthesizer (WPF)
• URL Navigate (WPF) not PAGE
  

XAML Examples:

• DockPanel
• Border
• TextBlock
• HyperLink
• Button's and Events

Download full source and binaries here.