It depends what your defending against and what your original password is.
If the purpose is to turn a short password into something more secure it is pointless. As tptacek is always saying; Sha1 is cheap. It is trivial to incorporate it into an attack :)
Your better off choosing a random long sentence as your password. Easier to remember and much more secure.
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Another easier and more secure is to use a sha1 hash on every password you generate and just use that as your password.
It depends what your defending against and what your original password is.
If the purpose is to turn a short password into something more secure it is pointless. As tptacek is always saying; Sha1 is cheap. It is trivial to incorporate it into an attack :)
Your better off choosing a random long sentence as your password. Easier to remember and much more secure.