How do I update the TexLive 2011 with the latest packages available on tug.org using the
This is all described on the
This should update the actual TeX Live manager
Alternatively, you may use the GUI
This way you can search for packages in CTAN too (most of them actually, as not all of them are supported by TexLive).
Needless to say, depending on your platform and the way you installed TexLive you may or you may not need root privileges.