Which tool(s) do you use to install/upgrade your app on production?
gamache: We don't use source control on our production machines (which I think is crap), so I use an rsync script from my dev machine.  Many people just scp the files over every time they make a change.  (There was once a tendency by a few folks to directly edit files on production, without ever checking these changes in to SVN; thank god this has decreased over time.)  Work is also too cheap to buy SQL migration tools for everyone who needs them, so database changes are applied by hand.  Not awesome.