I just got a gmail notice from a supplier that a package (that I had ordered) was shipped.
Not sure when it happened, but google is adding some very helpful links to the side of my email (not the old add based ones). One included a FedEx link for tracking my package (included the right tracking number). Another included a map option for my address. Since the email did not include an embedded link for tracking my package, I thought this was quite was quite cool. This seemed to be a natural step for Google, but it is quite nice to have some helpful links.
I wonder what other links they are supporting? Perhaps a calendar...