grappling with users

[Timothy Smith]

whats the correct method of creating a deamon user account, which you 
can use to start a deamon process but can't be logged into. so far i 
have not seen a single good explaination or example of this
below is my svn user, who has /sbin/nologin, but can't be used because 
it runs the no login shell.
whats the correct way to do this?

%su svn -c "svnadmin create /usr/local/svn/PubWare"
This account is currently not available.