if you follow the links back through the Wiki articles, looking at the MMU, you can get a pdf of the origianl user's guide! WOW.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790008382_1979008382.pdf
Rafe and his space suit info...
I believe that Rafe was referring to the Manned Maneuvering Unit (MMU):
http://en.wikipedia.org/wiki/Manned_Maneuvering_Unit
http://history.nasa.gov/SP-4219/Chapter13.html
Which is not used on a regular basis...actually, I think it has, as of yet, been just a one time experiment.
There is, however, the Simplified Aid for EVA Rescue (SAFER) system that is integrated for every astronaut using NASA EVA suits:
http://en.wikipedia.org/wiki/Simplified_Aid_for_EVA_Rescue
http://space.about.com/od/spaceexplorationtools/a/safer.htm
It's a "just in case" thing - the astronauts are still to be tethered at all time. However...I think someone is going to make a "go-go-gadget-arm" and/or spider-web shooter and/or Indiana Jones like whip.
Best,
Shalin

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