I assumed projectile damage was just something flying under power, such as a bullet or a bird, but something that was just falling would do melee.
I don't really think it makes too much difference, but yeah, that's my take.
(I also figure "radiation" would fall under energy, which is a pretty common comic damage source.)
Bunny rabbit damage is still the best damage.
Pfft, you've obviously never used rainbows.
Rainbow rabbit damage.
Or even better, Rainbow Rabit damage, amiright?
My daughter wanted yucky Turnip damage once, and she hasn't even played the game, she just saw the Plague rat in the sewer.
Rainbow Rabit and Yucky Turnip damage… Sound like opposites to me! 
(Now I want to go out and look for nyan rabbits… 
Not, you know, a lot, but yeah.)
I JUST used that at-will power last night with my half-orc cleric of The Raven Queen! Good reference.
I'm personally all for the established damage types. Some of my players like to refer to "Bubble" damage because of Twist the Ether's artwork. I'm always a stick in the mud and say "Yeah, but that's probably energy damage like the Explosive Bubbles or cold damage because…bubbles are wet? Um…yeah. Bubble isn't an established damage type!"
I never make a big deal out of it, but what can I say? Sometimes I can be a little allergic to fun.
When we get silly playing game's -- which is every time -- we tend to start renaming damage to something very loosely related to the original type, first to repeat a damage type... or stray so far from the original that no connection can be found has to take a drink.
I've owned three pet rabbits. On of them was quite big and somewhat stroppy and HATED being picked up - of course I had to pick him up sometimes and he was never very impressed.
And let me assure you, bunny rabbit damage is far worse than it sounds. Those claws are sharp, and those back legs are very strong. Once you've been scratched by a rabbit you don't forget it in a hurry.
My current rabbit is very small and far too confident to resort to violence the vast majority of the time, but I'm certain I wouldn't want to mess with him if he ever got in a scratching mood.
The last time I took bunny damage, it was because I was full...
Lance of Faith has something of a place of honor at our game table. When you have nothing else to do, no encounter/daily powers left, you can always rely on "Lllllllance of Faith!"
Does your rabbit have big sharp pointy teeth?
RUN AWAY!
And now we come full circle, since the weapon used to defeat the killer bunny was the Holy Handgrenade.
Now, does a Holy Hand Grenade deal Radiant, Fire, or Projectile damage? ;)
I owned a pet rabbit named snowball. Adorable little thing. It wouldn't eat celery, carrots, lettuce, or any other vegetable we fed it. It did eat rabbit food pellets, upholstery and chicken wire. When it started eating wooden table legs we had to get rid of it.
It deals all five.
For clarification:
Projectile damage
Fire damage
Radiant damage
Grenade damage
Holy Hand damage (colloquialy known as "Jesus damage")
Three, sir!
5. Holy Hand damage (colloquialy known as "Jesus damage")
Not to ever be confused with Jazz Hand damage, that is straight infernal.
Thank you. That was a litmus test.