I've uploaded all the sample games for you to use. I've uploaded the .GPD files so you can mess around with them in AGM and the playable versions. Enjoy!
A little late I know but Enterbrain has released a new sample game for Action Game Maker! An Action RPG named Coming of Age Day. They also released the resources used in the game so you can use them in your game.
Please note, users of the retail version of Action Game Maker can import resources.
Also, this weekend we will be switching over our Resource Database to use CopperMine. Once we've done that, the resources from Coming of Age Day will be added and the material pack removed from the download database.