Just got a MacBook Pro 15" so I'm unfamiliar with how the filesystem is laid out. I noticed when in my filesystem that I've got a few paths specifying httpd.conf:

/etc/apache2/httpd.conf
/opt/local/apache2/conf/httpd.conf
/private/etc/apache2/httpd.conf

The config files are different in lots of ways (user, group, server_root, modules that are loaded, etc.) The apache2 folders themselves also greatly differ.

It seems that the one getting used is either /etc/apache2/httpd.conf or /private/etc/apache2/httpd.conf

I'm wondering if I might have messed up my system after installing some packages (php5, django, etc) via macports and maybe ended up with 2 apache2 instances.

My questions are hence:

• which httpd.conf is the one being used ?
• what are the other files for?

thanks

--update--
To clarify, I didn't explicitly install apache2 via macports. I'm wondering if it was installed because it was a dependency. After more hunting around I'm learning I never should've installed php to begin with because Snow Leopard already includes php 5.3 from the get go.
http://serverfault.com/questions/82410/apache-2-and-php-5-3-via-macports

I'll need to open another question that asks about how the Mac filesystem works.
Thanks all for replies.