This is the standard TWiT Live show recording/broadcasting schedule.
Check the TWiT Live Calendar on Google for the most up to date 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.
Not listed: TWiT Live Specials