SCEE has released a demo of Patapon to coincide with Valentine's Day. The 40MB demo is available from the PC PlayStation Store and took a couple of minutes to download and install. The demo will also create a save file that is compatible with the retail copy of Patapon, due out here on the 22nd February. Playing the demo will also provide you with a rare Spear of Protection weapon.
I will post a quick impression once I get dinner over with and had a chance to give it a go.