This may be a daft question but wat is HDR?
Not a daft question at all. HDR stands for high dynamic range. When we talk about it we usually mean combining exposures at different brightnesses (usually in a program called Photomatix) so that you keep detail in the brightest and darkest parts of the image, especially to avoid "blown highlights" where parts of all of the sky, or other object, are so bright that the camera just sees them as plain white, with no texture or colour detail.
Cameras have a very limited dynamic range compared to the human eye, so when we see a landscape, we see detail in the sky and the foreground, but the camera might see a very dark foreground and a blown out sky. HDR is just a method of avoiding this.
Sorry, I'm not very good at explaining things!
Edit: The photos in my posts here: http://www.cameralabs.com/forum/viewtopic.php?t=5629
and here: http://www.cameralabs.com/forum/viewtopic.php?t=4710