It is highly recommended that you get a recent version of VLC on squeeze by installing the version from squeeze-backports.
Add the squeeze-backports repository and install VLC: sudo apt-get -t squeeze-backports install vlc
Without backports, you will end up with the very old version of VLC in vanilla squeeze (install vlc and browser-plugin-vlc as usual).
VLC is in testing.
But due to the way testing works, we can't guarantee if the latest version is available.
Install
vlc, browser-plugin-vlc, the usual way you do it.
VLC's latest packaged version is always in the official Debian unstable branch.