Here are some useful resources for troubleshooting Citrix Application Streaming.
Troubleshooting Application Streaming Issues – http://support.citrix.com/article/CTX113304
Application Streaming FAQs for Administrators – http://support.citrix.com/article/ctx118181
RadeRunSwitches – Application Streaming – http://community.citrix.com/blogs/citrite/josephno/2008/03/28/RadeRunSwitches+-+Application+Streaming
Citrix Application Streaming Guide for XenApp 5.0 – http://support.citrix.com/servlet/KbServlet/download/17820-102-18856/Application-Streaming-Guide.pdf
How to Find the .Rad File that is Used to Launch a Streamed Application – http://support.citrix.com/article/CTX114673
XenApp Plug-in for Streamed Apps – Version 1.3 – http://www.citrix.com/English/ss/downloads/details.asp?downloadId=1686680&productId=186&c1=sot2755
Application Streaming Utilities – http://support.citrix.com/article/ctx115137
How to Enable the Streaming Client Debug Console – http://support.citrix.com/article/ctx112472
Application Streaming Licensing Explained – http://support.citrix.com/article/ctx112636