Looking for a Windows SharePoint Services User Administration Web Part

Before I sit down and right one, maybe someone out there can point me to something that's already been done ...

I'm running Windows SharePoint Services in a public/private mode ... public landing site with anonymous readership followed by a private, members-only site.  It's all hosted on Windows SharePoint Services running on Windows Server 2003 in a workgroup.  I want a Web Part that enables me to manage users in the local Windows security database:

  • Create new users
  • Change user passwords
  • Delete users

On the end-user side, I want the same Web Part to enable users to change their own password.  Armed with this, provisioning of users would be a cakewalk.