These are some sample emacs config files I use on a daily basis, and also that I use to give emacs tutorials. The most interesting is probably emacs-extensions, which I've used to drive Clojure and Ruby REPL-interpretters.
The Windows help also shows how to capture the Win key, or how to mess with windows services from emacs (makes shell calls to the sc command line tool).
This can be used to update these files from a Dropbox-supervised directory.
> cat ../../Dropbox/common/emacs/mike/mine.txt | awk 'BEGIN {basedir="../../Dropbox/common/emacs/mike/"}; $0 !~ "^#" {print basedir "/" $0}' | xargs cp -t .