Now that you’ve got your new server visible to the wider Internet, there are more applications that you can host on it than you can poke a stick at.
I’ve chosen these because they form a core part of the bits necessary to allow you to have a web presence.
Your own mail server – hMailServer – http://diyws.ath.cx/lessons/lesson-14-how-to-install-hmailserver/
Your own webstore – eCommerce – http://diyws.ath.cx/lessons/lesson-18-how-to-install-oscommerce/
Statistics – a very important webmaster task – seeing what content is popular, what keywords people used to come to your site… oh, the numbers! – Google Analytics – read all about it! http://diyws.ath.cx/lessons/lesson-12-google-analytics/