This is the standard TWiT Live show recording/broadcasting schedule.
If you want to add the schedule to your Google Calendar click on the above link and then click the small "+Google Calendar" button in the bottom right corner of the schedule page that opens.
If you want to subscribe from iCal or your iPhone/iPod Touch use the address: TWiT Live Calendar. From your iPhone/iPod Touch the easiest way to subscribe is to send the link in an email and tap on it from the mail app in your iPhone/iPod Touch. This will automatically ask you if you want to subscribe to it.
Note: This does not take into account changes to the schedule or special events. Also, programs may be delayed due to technical difficulties.
Not listed: TWiT Live Specials