Anyway, unless you are using your Mac as a server, why are you running
Passenger on it in the first place? Mongrel is perfectly suitable for
A lot of people:
Work on more than one site at a time (during a day)
Want it always available rather than having to remember to start the server
Prefer to host as much as possible on the same technology (Apache, Passenger, MySQL is much better than Mongrel/SQLite even if you develop on Mac OS X and deploy on Linux).
I know I do (all of the above).