Mac OS X
I prefer the Mac way of installing software. Everything
except what is included in the operating system is
statically linked, OK I know, you don't like that. But It's
SOO easy to install!
Most Mac OS X programs consist of ONE file -- actually
a folder that looks like a file. Downloaded software is
always in the form of an auto-mounting image with that
one program "file" in it. Installing MS Office is just a
matter of copying a folder to your desired destination.
Almost no programs need root access (that's why there
is no root on default installations). But of course, there
can be a need for dynamic linking, therefore there is in
OS X, too, a package format that needs the password of
an administrator to be installed.
Sorry if this may not seem a *nix philosophy. But
remember that even tough OS X is less *nix-ish than
others, it is the most widely adopted *nix vendor. And
that of course because of it's user friendlyness