I'm not aware of any apps for Android yet, only the iPhone, Symbian, and WinMo.
Any of the DVRs I've seen use ActiveX to display the cameras via a browser. This is where he's telling you that you need Internet Explorer.
Hopefully the programmers across the pond will start writing Android apps. It's a great selling point that a customer can check their cameras from their phones, but as Symbian is non existent here, WinMo is pretty sparse, we've only been able to sell that as a feature to iPhone users.