Recently managed to setup an Ubuntu 10.04 server for my business Black Box Innovation Technologies. It uses LAMP (Linux, Apache, MySQL, PHP) for our hosted websites.
There were some things that I had to learn since the websites that we host were on a Windows XP based computer using XAMPP.
I'm currently trying to add more features to the Linux server, including a mail server and LDAP server, but I'm currently having trouble doing so. I've looked everywhere, but the tutorials do not seem to be of much help. Hopefully I will figure out soon.