gcalctool is the friendly calculater in GNOME. And now - after several others (at least cheese, zeitgeist, gnome-games)- it is ported to vala! Wow.
This didn't happen out of the blue, it was someone actually doing it - bobthegnome and PioneerAxon made this happen.
What does this mean? gcalctool should be easier to maintain and maybe attract even more contributors, as you don't have to deal with the whole boilerplate. And - Vala is gaining momentum. Nice. Cheers.