My gas glass cooktop keeps clicking. I unplugged the it and left it overnight. When I replugged it the next day it still continues to make the clicking sound. It is driving me nuts! Two days ago my husband did boil over a sauce pan of soup. How can I get the clicking to stop?

That was a really smart idea to unplug your cooktop and let it dry out. Many times that fixes the problem, however, if the problem returns as in your case it is time to replace the wire harness. Their are 4x switches associated and directly under the 4x burner knobs. Moisture can case a short and send a false single to ignite the burner when nothing has been turned on. Take a look at this picture from the link. Number 12 is the wire harness that has failed.
http://www.searspartsdirect.com/partsdirect/partsdirect/showSubComp.pd?imageUrl=http://c.searspartsdirect.com/lis_png/PLDM/W0108041-00002.png
You can purchase this switch by typing in the model number on a appliance parts website and doing a search.
If you are handy here are some general steps to remove and replace the bad igniter/switch harness.

1. Take off all the grates and burner caps
2. Unplug the unit and turn off the gas line
3. Un-screw the 2x screws on each burner
4. Remove burners and knobs
5. Lift up on the cooktop cover separate it from the burner box
6. Pop off the wire harness switches one by one and observe the way it comes off
7. Place the new wire harness into place and snap in switches then connect wires
8. Reinstall all components