Rushi Desai has only had 9 posts to his blog (just hired to Microsoft, and all 9 are this month), and this is already my new favorite blog to read.  Check out his post on Integrating InfoPath with SQL Server 2005.  It doesn't quite ring until you read the comment that Rushi left for clarification:

I wanted to point out the difference between submitting an InfoPath form to a web-service over HTTP (whehter it is hosted on IIS or SQL Server) and using the reliable delivery offered by Service Broker. Using Service Broker, the client does not need to be connected to the server and is resilient to network or system failures.