I've been an avid user of MYTHTV for over 5 years and have developed various utilities that I am making available for others to use:

• MYTH XBMC connect -- Integrates MYTHV and XBMC for a "best in class" experience.
  
• Low Power MYTHTV architecture -- A low power, instant on MYTHTV architecture. 
• mbemon -- An automated myth backend monitoring and recovery utility. 
• Comcast Cable -- Documents how I am able to use MYTHTV with Comcast now that Comcast is encrypting the majority of their channels.
  
• anacronsim -- Ensure that your daily, weekly and monthly cron-based maintenance jobs will run even if you shutdown your system when it is not in use.