Linux – All virtualhosts serving Apache default files

I'm trying to configure Apache as an in-network webserver, and am using the sites-available/sites-enabled feature as opposed to just static vhost files. I set up a couple VirtualHosts, all with a unique DocumentRoot, however request for all the VirtualHosts just serve up the "It's Working!" default file. I can't for the life of me figure out why it won't serve the content out of the correct directory. Here's the contents of the virtualhost directive files, let me know if I need to post more.

default (note that apache renames this to 000-default in sites-enabled, so it's not an ordering issue)

NameVirtualHost *:80
ServerName emp

<VirtualHost *:80>
 ServerAdmin webmaster@localhost
 ServerName emp
 DocumentRoot /var/www

 <Directory />
  Options FollowSymLinks
  AllowOverride None
 </Directory>
 <Directory /var/www/>
  Options Indexes FollowSymLinks MultiViews
  AllowOverride None
  Order allow,deny
  allow from all
 </Directory>

 ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
 <Directory "/usr/lib/cgi-bin">
  AllowOverride None
  Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
  Order allow,deny
  Allow from all
 </Directory>

 ErrorLog /var/log/apache2/error.log

 # Possible values include: debug, info, notice, warn, error, crit,
 # alert, emerg.
 LogLevel warn

 CustomLog /var/log/apache2/access.log combined

    Alias /doc/ "/usr/share/doc/"
    <Directory "/usr/share/doc/">
        Options Indexes MultiViews FollowSymLinks
        AllowOverride None
        Order deny,allow
        Deny from all
        Allow from 127.0.0.0/255.0.0.0 ::1/128
    </Directory>

</VirtualHost>

billmed

<VirtualHost *:80>
 ServerName billmed.emp
 ServerRoot /home/empression/Projects/billmed/web/httpdocs

 <Directory "/home/empression/Projects/billmed/web/httpdocs">
  Order Allow,Deny
  Allow from All
 </Directory>
</VirtualHost>

Note that I have DNS zones for both emp and billmed.emp, as well as entries in /etc/hosts. My ultimate goal is to set up this machine as an in-house webserver with a custom tld (emp), but progress has been pretty slow.

Some more info

/etc/hosts entries

#custom-sites
192.168.1.100 emp
192.168.1.100 billmed.emp

ports.conf

# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default
# This is also true if you have upgraded from before 2.2.9-3 (i.e. from
# Debian etch). See /usr/share/doc/apache2.2-common/NEWS.Debian.gz and
# README.Debian.gz

#NameVirtualHost *:80
Listen 80

<IfModule mod_ssl.c>
    # If you add NameVirtualHost *:443 here, you will also have to change
    # the VirtualHost statement in /etc/apache2/sites-available/default-ssl
    # to <VirtualHost *:443>
    # Server Name Indication for SSL named virtual hosts is currently not
    # supported by MSIE on Windows XP.
    Listen 443
</IfModule>

<IfModule mod_gnutls.c>
    Listen 443
</IfModule>

ls -l sites-enabled

empression@empression-server1:/etc/apache2/sites-available$ ls -l ../sites-enabled/
total 0
lrwxrwxrwx 1 root root 26 2010-05-22 12:36 000-default -> ../sites-available/default
lrwxrwxrwx 1 root root 26 2010-05-22 13:33 billmed -> ../sites-available/billmed

Update 2010-06-16

I wasn't able to work on this for a few weeks, but I have tried all the solutions posted below as of now, and am still unable to fix the problem so I have added a bounty.

Update

Here's the output of apache2ctl -t -D DUMP_VHOSTS

empression@empression-server1:~$ apache2ctl -t -D DUMP_VHOSTS
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
[Mon Jul 12 14:29:01 2010] [warn] NameVirtualHost 127.0.0.1:80 has no VirtualHosts
VirtualHost configuration:
192.168.1.100:80       is a NameVirtualHost
         default server billmed.emp (/etc/apache2/sites-enabled/billmed:1)
         port 80 namevhost billmed.emp (/etc/apache2/sites-enabled/billmed:1)
Syntax OK