Someone, about a week ago, asked about JFET use in logic circuits.
It turns out that the questioner was a bit ahead of the times.
There's a relatively new device called a G4-FET that's made up of a
MOSFET and a JFET, has 4 gates and can be used to make a 3-input NOT-
majority logic element.
Read about the construction here:
http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/10067/1/02-2177.pdf
And its use in logic here:
http://www.freshpatents.com/Universal-programmable-logic-gate-and-
routing-method-dt20070111ptan20070008013.php
Cheers,
Chuck