Matt_LRR said:
The ability to fly, but only while on board an aircraft.
-m
These guys must have the power of Ninja Posting, though that isn't so useless if one owns a website about useless super powers.
http://superuseless.blogspot.com/2009/01/blog-post.html
Anyway, the ability to disintegrate anything one comes into contact with using one hand while the other produces a perfect duplicate down to the last molecule of whatever was obliterated by it's opposite instantaneously. (For example:A person with a terminal illness is going to be replaced by a newly born person with a terminal illness who falsely believes that he or she has been living long with their pain and that she/he has anyone other than the person who created him/her for said pain.)Such a power would be somewhat non-conducive to conquest of mankind or liberating the oppressed.
If one hand is closed, disabled or detached, the other would lose access to its super power.
Okay, so this could be potentially useful is utilized creatively, like for squeezing large objects through small openings by putting one hand on the object and another through the opening or to kill someone only to replace them with an exact duplicate who thinks that she/he is the person who was reduced to sub-atomic particles or to free someone who is about to die anyway from wreckage surrounding them(leaving the perfect clone do enough living for the both of them), but, like context-sensitive super powers (Aqua Man could hold complete control over all of the fishing rights on the surface using his sub-sea telepathy and sink ships all over the globe)or non-combat oriented super power ideas, it has few applications for world domination or fighting off super villains(or even muggers).
How about: The power to shrink thumbnail images by using the power contained in one of the user's thumbnails but only images the size of the user's own thumbnails.
Also, the power to duplicate anyone's posts online at any time, any where.
Add-on: The ability to repeatedly slow any internet connection that one uses to a crawl but only if it isn't on purpose.