I was reading this 5thirtyone.com blog entry about Mailplane, a new desktop app (currently private beta, alas) that controls your Gmail mail account, thinking “wow, pretty neat, but not great.” Then I came upon this:

Anyone who uses screenshots to supplement their emails will enjoy the convenience of the ‘Screenshot’ functionality built right into Mailplane. ‘Screenshot’ will automatically open Apple’s Grab utility. Once you’ve made your selection, Mailplane automatically attaches the image to your current email.

Whoa, now that’s utility. And there’s more, including integration with Adress Book, iPhoto and more. <Drool>.

See a 5 min. (29MB) live demo of the application.