binary patch

When doing a package upgrade, I wondy if it should be possible to implement a mecanism for patching binaries instead of replacing the new one ? This could be usefull for use on a slow network connection. There exist somes tools for FreeBSD http://www.daemonology.net _

using freedesktop.org libs

The freebsd developpers are making some changes to the XFree86 ports to reduce the pain associated with upgrading and maintaining XFree86. http://www.freebsdforums.org/forums/showthread.php?threadid=16052 I found this idea very interesting. I think that the debian project should take more advant