I'm still vacillating in the midst of several choices--instantaneous teleportation, flying, invisibility--would be AWESOME.
But enhanced animal communication would be pretty cool, too. I'd love to be able to warn squirrels to stay out of the road, or just communicate in greater depth with my pets. That way I wouldn't have to make annoying people disappear - I could just torment them with bees or tell make cats dig up their gardens or whatever. Yeah, I'm going with the enhanced mental-telepathic animal communication. That would rule.
Lisa