This is a small category of hybrids; as only the Honda IMA is a production parallel-only hybrid, and they are "mild" hybrids because they do not have electric-only modes.
But, we now have a new unique example of a "full" parallel hybrid, called the Urbee:
SEMA 2010: Urbee Concept has just one word for us: "Plastics" — Autoblog Green
Urbee Hybrid Is World’s First 3D Printed Car - Green Car Reports
It is electric drive on the two front wheels, and has a very small (single cylinder?) ICE driving the single rear wheel -- that also steers! I'm not sure I like that... But, they have some interesting solutions.
The headroom looks pretty darn low, and the visibility out the windshield is quite limited; as you are looking through a 9-12" high "slot".
Oh, and there is the GM Precept, which is certainly a full parallel hybrid concept:
http://ecomodder.com/forum/showthrea...ame-14026.html