my-email: expand the aarch64 style message headers
my-yasnippet: use user-mail-address when expanding tags

When I'm in mail-mode this is more likely to be the correct email
address to use.
my-helm.el: add helm-descbinds to C-h h if we have it

This is a much more awesome way to find key bindings for a mode. I've
decided to blat C-h h which is just the "Hello" help page.
my-eshell.el: push eshell customisations into own file

Only two so far, a shell grab and history function.