CSEIT is an event presented by Citrix Escalation engineers and is mostly focused on troubleshooting of Citrix products. They had some really good sessions this year and the sessions are now posted on support site for download.
I highly recommend you to watch these free Citrix training videos/webcasts on NetScaler, XenServer and XenApp.
To view the CSEIT presentations and webcast recordings from the XenApp and NetScaler sessions, click the appropriate presentation title.
Note: A codec might be necessary to view some of the presentations. The codec is available at http://www.gotomeeting.com/codec
Here is a list of presentation I watched