I work in a primarily Windows environment and have to remote in to Windows servers and desktops. Upon installing Ubuntu 11.10 tsclient was not installed and I found the Remmina package. I was very happy with the results, but being in the UDS session on FreeRDP and Remmina I was astounded by the rich feature set that will be available in 12.04.
The amazing thing about the Remmina project is that it is all done by one developer right now. As a non-developer I certainly hope that more developers in the Ubuntu Community will consider becoming involved in this project. If you would like to get involved in the project you can get all the information at http://www.freerdp.com/ and they have a mailing list: https://lists.sourceforge.net/lists/listinfo/freerdp-devel. If you are a sysadmin that simply needs a fantastic RDP client you can add the following ppa: https://launchpad.net/~chihchun/+archive/freerdp