From 360is blog (http://360is.blogspot.com/2009/03/xenserver-administration-poster.html) you can find a very handy administration poster on XenServer.
Since XenServer was made freely available for downloada few weeks ago, there has been a surge in companies new to virtualization, taking their first steps into this area. As you would expect, this has resulted in lots of questions on the user forum and calls to our help desk.
360is have produced a XenServer administrators poster, in A4 format, for both new and experienced admins to download for free. Do let us know what you think, and make any suggestions for improvement via the normal channels.
Community Manager, Xen.org