I thought up a new superpower question a while ago.
First, you ask a group (whether it includes you is your choice), preferably with 4-9 members, what superpower they'd pick. This is fairly standard, but the comes the twist: You evaluate them not as individuals, but as a team. It gets rather interesting and allows efficient exclusion of overpowered choices with a simple rule of thumb: If it makes the rest of the group useless, it is too powerful.
Therefore, if you have people picking teleportation and invisibility, you can now, by working together, teleport into a building while being invisible. Telepaths can compensate for blindness or deafness of teammates (particularly powers which rely on one of those powers, such as telekinesis). Some powers, such as healing touch or forcefield generation become a whole lot more useful.
I have had some interesting answers.