As with all things you find resources as you need them, hopefully these may help you further your studies as they did mine or help you at work with your use of Citrix MetaFrame:

Citrix Online Solution Knowledgebase

Citrix Product Documentation Library

Citrix Systems FTP Server

Citrix Solution Tools                             

Citrix Training and Certification Course Descriptions

Citrix MetaFrame 1.8 Cramsession

Windows 2000 Magazine Network Thin Client Channel

The Thin Net Downloads

The Thin Net