GameSpot also have an article about the zombie hack'n'slash Dead Rising. Having been lucky enough to test out the demo they post their impressions and it sounds like they enjoyed themselves.

To get your hands on some of the game's more powerful weapons, you'll need to get into areas of the mall that are inaccessible at the outset. Based on our experiences with the demo, the only way to gain access to these areas will be to complete the main story missions--or cases--which will eventually lead you to the truth behind the zombie outbreak. After fighting alongside one of the game's key characters during a case, for example, he invited us to follow him to a security gate and then opened it for us.