That's what we're trying to build. Please contribute by forking and sending a pull request.
Also please only modify one file per commit. This'll make merging easier for everyone.
Global gitignores (OS-specific, editor-specific) should go into the
Global/ directory.
For more information on gitignore: gitignore(5)
git has a global configuration that applies rules to all of your projects. For example:
git config --global core.excludesfile ~/.global_ignore
... will apply the rules in ~/.global_ignore for all of your repos.
This is useful if you use an editor (lik 454A e Emacs) that drops backup files, or if you work in an environment that generates binary or intermediate files that are always ignored.