If you've got a Zune HD, you should know that Microsoft has made a whole bunch of new apps and games available for you. Ars Technica states that a total of nine apps are available;

Sudoku, Calculator, Weather, Texas hold 'em, Shell Game, Space Battle 3, Of the Future, Hexic, Goo Splat, and Chess. Just swing over to the Marketplace on your Zune HD and click on the new apps menu to locate your new programs.

All of these apps are "free", presuming you don't count the cost of watching an ad every time you try to boot up a game. Microsoft has sold ads during app launch. Not coincidentally, all of the programs take a long time to launch. Ars noted Chess alone took 30 seconds. I think I speak for a lot of people when I say, "I'd rather pay."