Kayaks or sort of.

The Spring issue of Northwest Fly Fishing had a two coulum add for these
things.
http://www.mokai.com/index.htm
According to the add you can move up and down the stream get out and fish ..
blah blah blah.
It does have an advantage in that you can keep your beer inside (looks like
there's room for a cooler) and if you get drunk you won't fall off like you
would on a jet-ski.
What would you do if one passed you on the way upstream??
Jiust cast at it? Is a wrist rocket ethical?