Good news for getting a better performance 'cause CDN server could be somewhere close to your user ;-) Read whole Scotts article about it: http://weblogs.asp.net/scottgu/archive/2009/09/15/announcing-the-microsoft-ajax-cdn.aspx. According to http://idunno.org/archive/2009/09/16/quick-thoughts-on-the-microsoft-ajax-cdn.aspx if you are using SSL then CDN is not for you.
Here is the demo code - WidgetsDemoCode.zip - from my Mobility Day 2009 session about building mobile widgets.
We will open the post-conference section these days and the registered attendees will have access to conference sessions Live Meeting video. And for those who could not attend there will be option to register/join and "reply" online conference.
I will talk about the Mobile Widgets at Mobility Day 2009 (http://www.mobilityday.com/) conference presenting the basics of creating, packing and deploying Mobile Widgets applications with the entry at using Widget API and communicating with the device. The same morning Damir Dobrić will talk about Widgets and WCF (REST way, JSON, XML) so if you interested in what you can do with Mobile Widgets on Windows Mobile® 6.5 platform the best way is to attend to both sessions ;-)