I understand that some of our members are not that good at googling for information. So, if you are new to WPF and want to learn more about it, here are some resources you can count on.
1. Introduction and Overview of WPF: http://www.microsoft.com/net/WindowsPresentationFoundation.aspx
2. WPF in MSDN Library: http://msdn.microsoft.com/en-us/library/ms754130.aspx
3. Official WPF Website: http://windowsclient.net/
4. WPF Videos: http://windowsclient.net/learn/videos_wpf.aspx
5: WPF Community: http://learnwpf.com/
You probably have heard of Microsoft Silverlight, which was previously known as WPF/E and is a subset of WPF. It has always been introduced or touted as a competitor to Adobe Flash. You can check it out at Http://silverlight.net for more information. I have written some tutorials / articles on Silverlight and WCF, which might be of interest to you. The links are provided on a post in WCF section on this forum. Have fun!