Unless you are using the nouveau driver the NVidia drivers are from the NVidia site
BTW, there is an 2011.09 release which uses the 280.13 version
Edit - if you have 2011.06 version installed and are fully upto date you should have the 280.13 version (unless you specifically declined that update)
Just exactly how am I supposed to know the driver in the 2011.09 release is the 280.13 version when I haven't the foggiest what that version is?