When it comes to bikes pretending to be cars this was the daddy of them all....... http://www.users.globalnet.co.uk/~bugivan/quasar_page.htm

These days if you want the best of both worlds this is the tool to go for...
http://www.carver-worldwide.com/Home/index.asp?L_ID=1

I believe prices start at an eye-watering £25k, thats about $50k over there.

Yea the carver is cool but i just dont see the point of it. Its more like a toy for who can get the most lean angle. Lean angle isn't determined by how skilled you are just by how aggressivly you turn the wheel. Turn the wheel at a steady pace at set speed you lean gently. Jerk it and it throws deep in. Seems kinda pointless. Mr.Clarkson summed it up best when chasing Hammond down the road with them both in them. He said it was like being in the cockpit of a fighter jet. And that sums it up really. Good to have a mess about in but no good for anything else!

I thought this was much cooler.  If you're going to have 2 front wheels, you might as well have a steering wheel.
...and the engine from the ZX-14! 

http://www.youtube.com/watch?v=fHe5m1t_WTg

pretty pimp.
My father is almost complete in building his trike.  He chopped the rear off a vw bug(engine and auto stick tranny), took the bare frame and front end from a 70's zuki gs750 and put em together.  Quite an accomplishment.  even more so considering hes in a wheel chair, has no proper shop(works from his driveway), and did 99%of it himself.  Its a wheelie machine!  All thats left now is to make it pretty and get it inspected again by the state.
Not an amazing machine by far.  But amazing in its own way.
I like the t-rex.  Anyone ever see it?

I love the t-rex.

They are so nice.  Theres this low slung coolness to them. You step out of a t-rex, all eyes turn to you.  Like wtf is that and who is that ugly mofo getting out.