I agree with Allen, RunNas is a great tool especially once you have it figured out. Its replaced the use of a few other older method that used to be common around here many years ago.

AS for an AWESOME Password Script this one by Richard is amazing. I really had high hopes of creating a KiXform out of it and worked with Shawn on it but it turned out to be a bit too complex to do what we'd wanted to do with the time we had so it never did get completed.

Flexible password generator