Are you talking about an HTML form ?
There could be a structured demo wiki entry with chapters, sections... Then just copy and paste.
Not so idiot-proof but true.
are you talking about a form to report e.g. a project? or to document a new hack of a certain type of sensor?
As i'm thinking about it. It could be a option for all those and for publishing a new library etc. Main benefit i'm thinking about is that all information is structured the same. This would ease searching (sifting through) and classify what goes under what subject.
A thing i personally would like is that submitting info (in the broadest sense) would not require me to learn to write 'wiki pages'.