Just a couple of highlight from the article:

Differences between administrative sessions (/admin, formerly /console) and user sessions:

• The Time Zone is not redirected for administrative sessions even if the setting is enabled on the server
• PNP Device Redirection is not available for administrative sessions
• TS Easy Print is not available for administrative sessions
• Drive and legacy print redirection is available for administrative and user sessions
• Administrative sessions are exempted from the Deny this user permission to log on to Terminal Server policy in the TS profile of the user.  If this option is selected for a user, they cannot connect remotely using MSTSC.EXE without using the /admin switch.  If the same user is part of the Administrators group or listed in the access control list that permits logon to administrative sessions then they can connect with the /admin switch
• Administrative sessions are exempt from the session limit imposed on the server
• When the limit on the number of administrative sessions is exceeded, the contention is handled by allowing a new user to disconnect existing users.  There is never any contention for CAL (user) sessions.  As long as you have a valid CAL, you can connect remotely unless the session limit has been reached

One thing that was very reassuring to read was that the author also found it fit to mention Cleartype "redirection" in Terminal Server 2008 but also to warn about the increased bandwidth it consumes. Be sure the read the entire article.