Internet Relay Chat (IRC) is a form of real-time Internet chat or synchronous conferencing. It is mainly designed for group (many-to-many) communication in discussion forums called channels, but also allows one-to-one communication and data transfers via private message. 
The #mythtv-users channel on freenode.net is usually the fastest way to get help about problems with MythTV. A daily chat log is kept at mythtv.beirdo.ca
The #mythtv channel on freenode.net is for developer discussions only.