There's a popular Ubuntu Howto which uses anonymous FTP and some other stuff, with lots of downloaded scripts. I'll make everything a lot simpler for you than following that one.
Objective: To have music files served through DAAP from a server that everyone can access to add new albums to. There's no configuration on the client and very little on the server. There's no security. Anyone can change or delete files.
Create the directory you want to share music from.
# mkdir /home/Music
You need to install Apache 2 and ZeroConf support for it.
# tasksel install web-server
# aptitude install libapache2-mod-dnssd
Next, you need to enable the DNSSD module
# a2enmod mod-dnssd
Edit your /etc/apache2/sites-enabled/000-default file and add the following two lines to the beginning of the file:
Add this to the bottom of the file:
Options Indexes MultiViews
allow from all
Alias /Music "/home/Music"
DNSSDServiceName "Shared Music"
You can change the name or the directory path if you like. You can even add five or six of these definitions if you want to.
Change the shared directory to be owned by the web server so that there are no permission problems.
# chown www-data:www-data -R /home/Music
Restart the web server. Be careful. Read the output and make sure that it starts correctly.
# /etc/init.d/apache2 restart
Go to Places > Network and find your share there at the top level. You can right-click to mount it ("Connect to this server").
You're finished. No scripts to download. No hacks. Just WebDAV and Avahi.
If you want to server the Music the ZeroConf way to a client, install Tangerine (which comes with Mono and GTK ... What a waste!). I prefer mt-daapd, but it's not available in the repositories anymore.
It uses a graphical configuration client. If you don't want that (I don't), you can create a .tangerine file.
name = Shared Music
password_file = /home/Music/.tangerine-passwd
debug = False
max_users = 0
log_file = /home/Music/.tangerine-log
port = 0
publish = True
plugins = file,session
directories = /home/Music
and then start tangerine.
$ tangerine /path/to/.tangerine
Open up your Rhythmbox and look over the music. It may take a few moments to come up.