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-n: dereference the existing link
-v: (optional) to be sure of what is being done
-f: force the deletion of the existing one
-s: creates a symlink
Be careful: the destination can also be a file or a directory and it will be overwritten.
There are 2 alternatives - vote for the best!
Instead of deleting an existing symlink and then re-creating it pointing at the new location, it is possible to perform the same action with this one command.
Interesting discussion on whether this is possible to do atomically here: http://answers.google.com/answers/threadview?id=526119
If you can do better, submit your command here.
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