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Administration Menu > System Admin > Send Message to Users
You'll have to do some filtering to get it to work for just one user, but it's doable.
Variables:
Useful Tags:
{X_UID} will print user id
{X_UNAME} will print user name
{X_UEMAIL} will print user email
{X_UACTLINK} will print user activation link
If you are manually assigning the password for users, just manually add it to the email.
HTH
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.