Recent OS X TIL articles: Server full name required; Adding an alert sound

106406: Mac OS X 10.0: Internet Services Requires Full Server Names states: "Internet services in Mac OS X require that you enter the full name of a server, not just its subdomain name." If you do not, you may not be able to be get or send email. Or an alert box appears with a message that indicates the server or its IP address could not be found."

106409: Mac OS X 10.0: How to Add an Alert Sound explains how to add a new Alert sound. Basically, you drag the AIFF sound file to the Sounds folder inside the Library folder in your Home directory. There is no way to record a sound via the Sound System Preference itself (as you can do in Mac OS 9).