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Wakestaking involves maneuvering a wakeboard over a skateboarding course. It appears that competitors are yanked along a tow line and must safely but acrobatically pass the obstacles. Here are highlights from a recent competition in Cologne, Germany. http://www.waketheline.com/blog/ -via @Christopher Jobson
Wakeskating is actually done using a wakeskate (it's like a wakeboard without bindings and the surface has more grip), it doesn't matter where. The video has highlights from both the wakeboarding and wakeskating parts of the competition.
Gayest background music EVER! (and cranked to 12 in the mix).
Wakeskating does not involve a wakeboard whatsoever.
This video is just plain ol' wakeboarding using a wynch.
Wakeskating involves using a board with a top surface similar to a skateboard. You wear shoes, and you are not strapped to the board.
This is an example of wakeskating: http://www.youtube.com/watch?v=iuCf_OT65fg