http://nikspatel.wordpress.com/2011/07/20/debug-browser-enabled-infopath-2010-forms-deployed-on-sharepoint-2010-using-visual-studio-2010/
http://msdn.microsoft.com/en-us/library/gg271285.aspx
http://msdn.microsoft.com/en-us/library/aa944831(v=office.11).aspx
http://blogs.msdn.com/b/infopath/archive/2006/11/24/debugging-browser-forms.aspx