I would want to be able to write legibly with both hands simultaneously. Think about it: That would mean that the two hemispheres of my brain could work independently and simultaneously. I could read 2different things at the same time and comprehend it. I could do the work of two people. That would be pretty awesome.
I would have telekinesis, so that I could fold and put away all of the laundry with a few pointed thoughts. I already send plenty of those thoughts in the direction of my laundry basket each day, so it wouldn't be any more effort than I already exert.
I would have some super-power or another that caused my metabolism to kick into high gear. Super speed, super strength, it wouldn't matter... as long as I could eat as much chocolate lava cake as I want.
I would be able to re-energize in seconds, thus freeing up an additional 8 hours in each day for productivity. I tried using caffeine to this end in college, and would stay up for up to 52 hours straight at a time. It was a flawed system, hence the need for super-powers.
I would be the best darn mediator ever. I would be able to calm people down so well, you'd start calling me Xanax.
My last super-power would be to convince ALL of you to join Michelle's and my party tomorrow might at 7:30! I'm wearing a totally awesome Christmas sweater, and let's face it... you really don't want to miss out on that. Just admit it in the comments. You don't want to miss it, and therefore, you will join in the fun.
If you could have any super-powers, what would yours be???