I have been working on my MCITP: Enterprise Administrator certification on Windows 2008. It talks a lot about the TS enchancements on Windows 2008, such as Gateway Service, Web Service, Broker Service, icons on Desktop and etc. They sound just like Citrix Secure Gateway, Web Interface, Load Balancing, Program Neighborhood agent and etc. LoL. I haven't tried TS on Windows 2008 yet but will soon. Isn't Microsoft kind of late in catching up since Citrix Metaframe/MPS technology is already in a matured state for a long time? What do you think?
Brian wrote a summary of this very topic earlier this year.
http://www.brianmadden.com/blogs/brianmadden/archive/2008/05/14/windows-2008-terminal-services-versus-citrix-presentation-server-xenapp-citrix-has-nothing-to-worry-about.aspx