using Mac OS X Server for deployment?

Hi,

Is anyone running Mac OS X Server 10.5.1 (or 10.4.x) for Rails apps with lots of users? If not, do you know of sites (any sites) using Mac OS X Server?

Are there known issues specific to Mac OS X Server for Rails apps or PostgreSQL (besides the cost of the box)? I've never heard of anyone actually using Mac OS X Server for web apps.

Thanks,
Chuck