I'm after a way to reduce the following code down to one line, I assume through list comprehension.
string = raw_input("String: ")
stringlist = 
for char in string:
So, you basically want to reverse the string and create a list from its reversed version:
stringlist = list(reversed(raw_input("String: ")))
The following is even shorter, but probably a bit harder to read:
stringlist = list(raw_input("String: ")[::-1])
This code uses extended slices.