Citrix offers web-based product training for free.
Here is an overview on current offerings :
CNS-100-1 W
Citrix NetScaler 9.2 Technology Overview
http://citrixtraining.com/courses/course_view.cfm/course_id:286
CEV-100-3 W
Getting startet with Citrix Essentials for Hyper-V
http://www.citrixtraining.com/courses/course_view.cfm/course_id:275/cgroup_id:30
CXA 101-2W
XenApp 6 Technology Overview
http://citrixtraining.com/courses/course_view.cfm/course_id:285
CXS 100-1W
XenServer 5.6 Technology Overview
http://www.citrixtraining.com/courses/course_view.cfm/course_id:297/cgroup_id:30
CEX 100-1
Introducing Citrix Essentials for XenServer 5.5
http://www.citrixtraining.com/courses/course_view.cfm/course_id:274/cgroup_id:30
CBR 100-1W
Accelerating Citrix XenDesktop with Citrix Branch Repeater
http://citrixtraining.com/courses/course_view.cfm/course_id:298/cgroup_id:30
CXD 101-1
Citrix XenDesktop 5 Overview
http://citrixtraining.com/courses/course_view.cfm/course_id:276/cgroup_id:30
