I have a 2000 Ford Taurus that was running great when I parked it yesterday. Today it will not turn over, all electrical is out.

Is it only when you put it in Drive? Or when it is idling in Park?

You have a shift interlock cable that is suppose to release the shifter when you depress the brake pedal, it sounds like there might be a problem with the interlock cable or the interlock solenoid.

This Sounds Like The Linkage On The Gear Box Has Changed ,The Lever Is Not Reaching The Correct Position When it Is moved to park ,Drive, Etc.
Check The Cable ,Linkages From The Change Lever To The Gear Box

Is your dome light coming on? do the power locks work?
Your battery may be dead, or you may have blown a main fuse (under the hood)

did you hook up the flywheel to the torque converter? the clicking and grinding noise could be the trans is in park and the flywheel is going around, or the torque converter is bound up and not properly in the pump of the trans, and the clicking and grinding could be the parking pawl trying to stop and lock the trans.(this is what stops the car from rolling) I think its a torque converter alignment problem.

fords famous power steering pump design its common if you replace the pump with a rebuilt one there is a paper with the new pump that warns you of this noise for about 500 miles after installing hope this helps

My 2000 ford taurus shakes at 30, 40 and 60mph, ive gotten new tires and balancing. Still unsure of what's going on.

Please Help.

Take it back to the JACKASSES that fixed it, and tell THEM to FIX it!

Verify the fuel relay

This could be a bad a/c compressor or compressor pulley bearing.Try removing the serpentine belt and turning the compressor by itself.The bearing should turn very easily,and the compressor itself should turn.If it is vety hard to turn,it is bad.