Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I believe the calendar at the top is actually Dateline and not Geektool.

The date pieces are really easy and there's a lot of examples in the mega Geektool thread. The clock in the bottom right should be really easy. The iTunes items I believe are discussed in the mega thread as well, but I haven't done any iTunes related Geektool scripts.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.