I use PhotoShop CS and been wondering if the High Dynamic Range tools in CS2 would make it worth thinking about an upgrade. This astonishing picture of Tokyo by night has made me think it might be time to think about it. Basically HDR enables one to create a composite image from a number of photographs made with different exposures, thereby increasing the dynamic range of the image. Useful introduction here. There’s also a HDR pool on Flickr.
Thanks to James Cridland for the link.