There's also a Chrome extension that uses gravatar to show the picture of who you're mailing with, in case they didn't add an avatar themself. I forgot what the name was, but I have it on my laptop at home. (I should really get into synching my extensions as well.)

Regarding this new feature: I find it kind of annoying that you _have_ to have Jetpack installed. I've used it for many years, but recently removed all traces because I did not like the extra tracking scripts it was using. (For example: Quantcast. Hope you're reading this, Matt.) Guess I won't be giving this new Gravatar functionality a try.