I backported vlc myself for Lenny from unstable.
During the upgrade (from version 0.8.6.h-4+lenny2) I got the following
Unpacking vlc-data (from .../vlc-data_1.0.5-1~bpo1_all.deb) ...
dpkg: error processing /var/cache/apt/archives/vlc-data_1.0.5-1~bpo1_all.deb
trying to overwrite `/usr/share/pixmaps/vlc.png', which is also in package vlc
As I did not make any changes that would affect this, I expect the file
conflict will also affect Lenny->Squeeze upgrades.
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