Archive and install - what to with previous system content?

hello
i updated to osx 10.5.1, i did the archive and install
when i went to open my apps foilder, only apple apps were there. all other apps were in the previous syst folder. so, i dragged those apps over to the 'new' apps folder. there were some duplicate apple apps, so i did not drag them over.
my question is, can i dump those 'old' apps?
there are also other annoying files/folders (library, mach.sym, private, system, users). they are silly, can i dump them? machine seems to be running fine withouth them
thanks
wayne

alex
very kind of you to respond
it gets a bit more confusing in the non app folders as to what i need and or do not need.
how can i determine what to keep / throw away.
thanks again
wayne

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