Channel9 has a great video on BizTalk.Net by John Shewchuk and Dennis Pilarinos (Creators). BizTalk.Net is an ESB (Enterprise Service Bus) in the cloud. John and Dennis do a great job of giving an overview of BizTalk.Net as well as some great Demos. BizTalk.Net is NOT BizTalk. It’s only about 20 minutes but well worth it.
BizTalk.Net could really push SOA and SAAS by making it VERY easy to share services and information between apps or businesses.